Upgrading to 7 is probably more advisable on newer hardware, and especially if you're gaming. Other than that, I like OldJoe's build. Might want to swap in an ASUS or MSi 5770 though. Those seem to have a pretty good repuation. Also, don't expect to max things at 1920x1080/1920x1200. You'd need a bit more power in the CPU/GPU department for it to be comfortable. If you're just going to be playing at lower/more common resolutions, then you shouldn't have too many issues.