I have to say...if OP want to get the best out of his new rig, he really should stretch the budget, so that the build would have at least:
2500K (those games listed would love the SB CPU, especially the ones don't use more than two cores)
P67 board
6850/GTX460 1GB
4GB of RAM
Windows 7 64-bit
Basically the same as my suggestion except I went for the 5850 as it's a bit faster and cheaper than the cards you picked.