Help with a low-med specs PC

ur thread is all over the place

I'll need a budget if you want help.

Clicky.

a 7770 would be cheaper and better

Not bad. I've got a 7770 1GB GDDR5 with that same CPU. I'm playing on my 42 inch 1080p TV with a resolution 1920 X 1080. 6GB DDR3. Works perfect. Going to go crossfire this year.

That looks a lot like something I'm intending to build in the future.

You could use pcpartpicker.com (choose the appropriate location top-right corner of site).
When I built a similar PC using the site, I threw in an XFX 500w 80 Plus Bronze PSU and case really doesn't matter, choose a cheap one that fits your mobo (respectively if your mobo is Micro-ATX / Mid-ATX you can choose any case), I'd choose one that has 4 USB ports at the front, for convenience.

That pc at that resolution can run those games on high without any problems, except bf3 maybe in mp with lots of players

The cpu is great, but it's a tad old, but great for the price range. If u plan to OC it, go for the 955 one, it's way more OC-able than the 965.
The gpu is not bad, u can go for a 550 also if u are into PhysX and that kind of stuff, but 7770 offers more performance at the same price.
For the mobo, go for a AM3+ just in case you are going to make an upgrade in the future (don't worry AM3+ is backwards compatible with AM3 socket CPU such as the Phenom) thus u will leave some headroom for maybe a vishera cpu ( 8350 and 6300 are complete jewels ) , I suggest getting a Asrock 970 Pro3 with 970 chip set, it's not the best chipset but it's not bad either, it's in between.

Hope I helped.

You could try the KBMOD site. It may or may not help. They update build guides regularly.