Advice on Building a PC?

A WiFi card would not be the best choice if you want minimal lag.

I picked up the Hyper 212 for a temp fix for my 1600X while I await the AM4 upgrade kit for my Maelstrom 240T.
1) It's HUGE - barely fits in my case.
2) It's quite loud compared to a AIO watercooled.
3) If you are going to overclock - forget it - it keeps my CPU cool (around 50C and I'm not overclocked) until I start playing games - it then pretty much goes into overdrive and after a while it just can't keep up - It's a very poor cooler.
4) The amount of pressure needed to clip it into place is insane - I honestly thought I was going to break my CPU - and that was before I flipped the clip over.

If you'll be building it yourself, best advice I can give you is to just take your time. If you get frustrated while building it, take a break. You're more likely to make an error if you are frustrated or trying to build it quickly. It sucks, I know, but it saves you from having to buy replacement parts because of a simple mistake.

Edit: Doesn't seem to be what you asked, sorry bout that.

a ryzen 5 build wouldn't be THAT much more expensive imo

Well if your listening...
I would strongly avoid that build in any way... Its to much dated.
Best be looking for ryzen 3 or 5 ( not that much expensive tbh) with r5 1600 you wont even need a cooler, the box one is pretty good
and wait a bit for some income and get an 1060 or 580 and be happy for couple of years with a 1080p screen!

The cpu and gpu are both dated. 1050 is about same price and is much faster. The current Ryzen CPUs are much better value than A10. Also the new intel cpus released next week, specially the i3 might provide good value.

In a store where i bought my pc it costed like 25€ for them to build the pc. I thought I could build one, but didn't want to risk messing something up...

About the pc, you should ask yourself what do you want to play really... When i bought a laptop 2 years ago, csgo was all i wanted to play, 2 years later, wanted to play battlefield 1, couldnt.... bought myself a 900€ desktop for gaming, runs everything and will run everything for the next 5 years.

Try look for second hand i5 2 or 3 gen with decent motherboard
ebay / gumtree ect.

my personal second hand bulid VR ready
https://pcpartpicker.com/b/JzNQzy £390

I'm personally curious why you would choose to pair an AMD cpu with an NVIDIA GPU. I have not done a new build in a few years, but it used to be AMD/ATI vs INTEL/NVIDIA... you would normally get better performance out of the box when matching your gpu/cpu providers. That may not be something that is still happening today... maybe some of the other users can comment.

Update 2 is by far better than the original build. You get so much more for the money, even if it costs a bit more. Do you really need an optical drive? Easy place to save.

If you need WIFI, maybe get a better motherboard with it included?

Am I missing something, or is there no HDD?

The Ryzen 5 + Geforce 1050 Ti build is good, just get a cheap SSD (for windows) + hard drive (for everything else) and you'll be set. :)

Commenting only on your original build and not giving item specific suggestions (sorry)

Processor = No, go for a Ryzen 3 or 5 series.
CPU Cooler = Not sure, looks like a decent cooler with 8 heat pipes but rather large...could do better? Second hand is a good option for coolers (do not forget you might need thermal paste)
Motherboard = That is very good value but not getting a DDR4 compatible board would be odd.
RAM = DDR3 is not the future, although decent.
GPU = The new nVidia 1000 series is a big upgrade in power to performance a 1060 would be ideal but 1050 is alright.
Case = For the price is fine.
Power Supply = Fine for your needs.
Optical Drive = Do you want one? if so fine.
Wireless = Never thought of a PCI express wireless card, but it does the job.

I see you already had more useful replies than mine, but I am just giving general advice.

Your CPU and GPU will not last very long.

A Ryzen 5 1500x will cost about $50 more and give double the performance- it will last you for years.
A GTX 1050 ti will cost $50 more and give you %150 performance over the 750 ti and it will not bump your power profile.

If you are going with a wifi card, you can also consider powerline adapter for ethernet link through your electrical outlets (about $40 for an actual ethernet connection), or a usb wifi adapter which would only cost about half the price. I actually prefer usb adapters myself because I can connect it to a usb cable and then place the adapter somewhere where it will get the best signal. If it is a wireless pci card, you'd have to move the entire pc if the signal was not too great.

Edit: I just saw your edit now, that second build will keep you happy for years. :)

CPU + Mobo + 16 gb ram http://www.ebay.com/itm/ASUS-P8Z77-V-LK-Intel-Z77-Motherboard-Intel-Core-i5-3570-16GB-Corsair-Ram/192274461695 will go below 150$ or find similar
GPU try buy on ebay bid rx 460 for below 70$ or by brand new rx 560

• rest new
  https://pcpartpicker.com/list/CVgmsJ

And you will have decent PC below 450$

I presume you don't need a disk drive? And do you know if you can install Windows 10 on another system, or do you have a license key waiting for a new system?

why not a single stick of 8gb and a micro atx for the savings?