I'd go with an EVGA 560Ti Superclocked (cheaper than the non-superclocked version when I got it). I can play every game on high settings with good fps (but I do play windowed 1366x768 or something like that). And as patonb said, lower the psu and you've got enough for Windows 7...
(KSoD, I love your dancing android )
(KSoD, I love your dancing android )