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#11
I also have a EVGA GTX260 and love it on Windows 7 Professional 64, no problems yet.
Now as to DirectX 11, yes these is some support starting to show up, Battlefield: Bad Company 2 has DX11 effects, soft shadows etc..,
Even tho I mostly support Nvidia, I would say go with ATI because it gives you some "future padding" as per DX11.