Need some computer opinions

It CAN run those games but it'll be outdated in 2 years. And you'll have to play in low or medium to get a stable 60 FPS.

Look for at least 1060 (hell, it'll be outdated in 2 years too) and i7-7600. 1060 + 7600 can run W3 on 60 FPS on medium- high mixed settings.

But I suggest you to increase your budget and buy a 1070.

The 6300 is kinda ancient. Preferably you'd custom build, if that is not an option then increasing the budget will get you a more modern system, these budget builds tend to sell you old gear.

I would watch https://www.reddit.com/r/buildapcsales. They have a [Prebuilt] tag. Prebuilts are a good option right now since it can be pretty annoying to source a video card for one you build yourself. Another good place to look is https://slickdeals.net/forums/forumdisplay.php?f=9.

buy AMD Ryzen

Look at other sites. Amazon generally follows prebuilts with the overpriced gpus and ram, but some other online places offer customization and to run those games you will need to rack up a $850~ budget for smooth gameplay.

The GPU is alright. I would get something with a better CPU like a Ryzen 5 1600 or an Intel i5 8400.

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I suggest getting an Nvidia card, right now a 1050 is waaay cheaper than an AMD 270, and the GTX 1050 does things a bit better in some aspects, others the AMD 270 wins but not by much, not enough to justify the price difference.

And I own an AMD FX 6300 processor, it ain't bad, but it's not that good. I could run Witcher 3 and Hellblade at max settings with a GTX 1050, but at 720p resolution (Yep, shitty monitor), but currently I'm having trouble getting AC: Origins to run at high settings as it is a really CPU intensive game, which is where the bottleneck is coming from.

Get a Intel i7-7700k at least, and a GTX 1060 so your PC lasts a little longer. I'd recommend getting a 1080 if you have the money, but with the current state of cryptocurrency mining, you'd find a 1080 reaaaally expensive. That's if you can find one, they're kind of rare to find these days, pretty much out of stock everywhere.

TL;DR: Get an intel i7-7700k and a GTX 1060, 8 GB of RAM (16 if you can afford it). Happy upgrading! :D

you need a SSD like Samsung 850 EVO

Bump.

Bump!

I'll offer you some advice from a more budget-conscientious perspective:
How important are graphics to you?
If not very, then you can get that very first one you posted and keep it for 5+ years and you'll be fine AS LONG AS YOU RUN GAMES ON LOWER GRAPHICS. For example, I'm running everything fine on a GTX 950 (came out ~mid 2015), and I can play Middle Earth: Shadow of War, Rise of the Tomb Raider, XCOM 2, Superhot, etc. perfectly fine. Just on lower settings. That being said, the advice below will be adaptable to your budget, so if the best god damn GPU on the market today is within your budget, this will still apply to get the best value for your dollar in this market.

WHY can't you build your own? If the answer is no experience/time/tools/etc., take this advice:
You don't want to COMPLETELY build your own. In fact, in today's market (F* you, crypto-mining), with all the good graphics cards getting hella-marked up to account for demand caused by bitcoin/etc., getting a pre-built and then customizing it is the most cost-effective way to go.
Here's your criteria: Get a PC in a case you like with a good CPU and a good GPU. Don't worry too much about all the rest. Pick a GPU/CPU combo that is what you need for your personal minimum requirements, and get the CHEAPEST pre-built you can find (from a good retailer, of course; you don't want to buy broken things).You want to get pre-built with GPU because that can save you $200/$300 versus buying it separately, and you want a pre-built with CPU because that's really the only component that requires skill/tools to install. Literally everything else is plug-and-play easy.
Hopefully you've picked a combo with options. If so, here's other things to look out for.
PSU: Look for better PSU. If it's 80+ bronze/silver/gold certified, that's good/better/awesome. DO NOT get it if the PSU isn't at least 80+ rated.
RAM: Buying RAM separately is the best way to go, but that doesn't mean included RAM is something to sneer at. Look at 1: The number of slots, and 2: The number of sticks. For example, let's say your config at good prices has options with 8GB ram. There's ones with 1 stick/2 slots, 2 stick/2 slots, 1 stick/4 slots, and 2 stick/4 slots. 1 Stick would be preferable to 2 sticks, as that means you've got more open slots to expand your RAM if you need to upgrade, and 4 slots would be better as you'd have more slots total. However, single larger sticks are often more expensive than multi-smaller sticks (and they can't multi-thread (or whatever it's called; don't bash me, I'm tired), but that's a discussion for another time) as well, but for gaming larger sticks is more efficient. My choice from those would be the 2/4 combo, as it would let you pair your two smaller sticks, and give you plenty of room to upgrade, while saving cost over the 1/4 option. This would give you the ability to upgrade over time and adapt to the market's demand while never spending too much at once to upgrade your measly two slots with more expensive, larger sticks.
HDD/SSD: Get the smallest one you can. Ideally with the specs you want, you could find somethign with a 256GB HDD. Buying an aftermarket drive(s) would be the most cost effective option, and you'd get much more memory for your buck. I would recommend a small SSD (to run your OS; your computer will be MUCH faster by that alone), and a larger HDD (for main storage). This is the most cost-effective option to get a fast PC with lots of storage. You can even convert the small HDD it comes with into an external drive to back up important files safely and without having to bother with a "cloud" (i.e. a stranger's computer).

TL;DR: If you can, get a pre-built with the best CPU/GPU/PSU combo you can afford with the smallest hard drive and at least a couple extra RAM slots, and you can semi-build your own PC for MUCH cheaper than either buying a fully pre-built system or doing a fully custom system.

FX series CPU's are slightly outdated try searching for Ryzen 5 1600 or go intel with i5-7600k. Ryzen 7 or i7 would be an overkill at that price point, better spend money on GPU. In most cases it will be the limiting factor, not CPU.

1050 Ti is right now about fine to play in 1080p in 30 fps high or 60fps medium. If that is enough for you - go right ahead.

In about 18-24 months ps4 Super pro and Xbox One XXX should be introduced. After that 1050 ti will struggle in 1080p. 1060 probably will be fine, especially 6 GB model.

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I think it's nice.
What kind of gaming you're looking (resolution - graphic quality - framerate)?
You said you can't custom build, is it fear of screwing up or you just want a console experience (plug and play)?
if it's the latter, try Corsair One http://www.corsair.com/en-us/landing/one
or ZOTAC GAMING MEK1 https://www.newegg.com/Product/Product.aspx?Item=N82E16883218082

The second one is better, but looks to be out of stock. Other good ones I found were also out of stock. However, may be worth ordering and waiting. This one looks to me quite good for the price.

Edit: This one looks to be in stock, and would be better than your original choice, and for only $20 + change more.

Edit: Even cheaper. Only $4 more than your original choice and will play games much better.

Alright, I am completely against buying prebuilt systems normally... but here's one that MIGHT be what you are looking for:
Link

It has a great CPU, which you can even overclock if you feel up to it later on. It has an SSD which makes such a HUGE difference for me personally, for any tasks including gaming. The GPU is a 1060, which honestly would result in less than 5 fps loss over a 1070; or about 10 fps loss over a 1080. If you feel you can bring up the $800 budget to a $1000, I feel this build would last you quite a while for games such as the ones you listed.

Also if you could find a similar one with a decent sized SSD like this one for cheaper, obviously go for it instead.

EDIT: By the way, if you can somehow manage to add an SSD in there yourself, or with the help of someone; just get a decently priced 1060 as others have listed and just get an SSD for a slightly cheaper price than what this is adding for that difference.

I think, depending on your local prices, that you could just build a PC from scratch instead of using prebuilt PCs. Often preassembled PCs just boast about CPU and graphics card, but use crappy secondary parts like PSU and case, mostly cheap (and potentially dangerous) chinese knockoffs to save money.
However finding GPUs right now is quite a hassle and DDR4 memories are expensive, so if you're not in a rush you can wait for prices to adjust and for a restock.

Idk man for me im the guy who buying peace by peace its better u will go cheaper and u can choose what u think will go well not 900e for example for something what u can get cheaper..

All that SSD stuff people is recommending you is something you must have in a computer, since you talk about getting a +900$ pc, I suggest you to buy a 256GB SSD and a 1TB HDD, also try to find a pc withouth(wtf<?) windows installed because thats something people add to the price
(+50€) and you can install almost any windows you want by free, if you dont know how, there are a lot of tutorials on youtube and you will save lot of money, also 8GB RAM, max 12GB, if you want a gaming pc, with a 1050ti 4GB to up you will be happy enough,
If you want to install LOT of heavy games go for 500 GB SSD.