Hey, check this video out. It's a bit long but it's very informative. At the very least watch the beginning intro where he explains the purpose of the video and then towards the end when he's showcasing all the games.
http://www.youtube.com/watch?v=Bh455l3348s&list=UUw7FkXsC00lH2v2yB5LQoYA&index=1What really spoke to me is when he played BF3 at 60 frames per second. Battlefield 3, if you didn't know, is probably the most graphically intensive game on the PC platform. Now this PC is by no means the cream of the crop but it's still impressive because his build is about the same price as a PS3 yet will play BF3 at a higher resolution and even if the settings are set at low or near low, it will still look and more importantly perform better than the same game on the PS3.