400-$500 Gaming Rig

I would reconsider the request for Nvidia and Intel - at this pricepoint, an A10 APU with super-fast ram will blow them out of the water. (Especially at that resolution, where CPU oomph matters more.)

Alright, so Radeon and AMD? I can do that. I'll re-edit. Anyone else who sees this, feel free to brainstorm if you think it's a possibility.

Something to consider, if your old optical drive has an IDE connector, it won't work. If you aren't sure: http://www.avforums.com/forums/attachments/hard-disks-m... Sorry I am feeling too lazy to embed the image.

The hard drive (yes I know you have an optical drive) on top is SATA, the one of the bottom is IDE. Unless you get a motherboard that has IDE on board, most won't, then you are out of luck.

Wow, alright. Thanks a lot, I'll check later... That never crossed my mind, partly because I'm half asleep and partly because I have little to no knowledge of hardware.

Hey, not sure if you are still awake, I had a little fun: http://pcpartpicker.com/p/mAer

Edit: Okay so I saw something I didn't expect, a 560ti for less than $100. Yes it is last generation, and yes it uses a lot more power (a lot more) but it has the performance to back it up, and for the price, I am just impressed.

You can safely ignore what I have below, because instead of making a new PCPartPicker list, I re-wrote the old one by accident. The good news is that I cut the overall pric by around $60, the bad news is that it has 4GB ram and a 500GB hard drive (add $15 and $30 respectively to get to the 8GB and 1TB). Pretty much everything else is the same.
/edit

If you do NOT include tax, and you DO include rebates, that build skims in just under 500 dollars. It does need a little more up front to handle tax etc, but it will have more horse power than an APU (I am a fan of AMD APUs by the way).

Disclaimer: You need to be happy with the case, I just found that one, and it doesn't really mean anything to me  

You CAN go cheaper without hurting your quality. 4GB ram instead of 8, maybe a cheaper PSU, less hard drive space (500GB seems like plenty to me, and I got you 1TB). The Motherboard can be cut down too, but regarding the Mobo, it is already lacking features some people might want, like more audio channels. However, it says it has USB 3.0 on headers (unless I mis-read) so there isn't too much compromise (do not be mistaken, there is compromise).

I hope it helps, it was my first time using pcpartpicker, and I had fun doing it.

P.S. I know there are some parts not from your prefered retailers, I tried but it isn't always easy.  

I was sleeping, and thanks. That will work great. 500 GB hdd is fine, I doubt I'll end up using half of it. Far as ram goes... I'll need to pay the extra for 8 GB. I doubt 4 would be enough.

Well, thanks for putting time into an answer, do you think it can handle the games mentioned above with ease?

Best answer selected by RageNPlay.

Fantastic, thanks for the help. =)

Case is fine.