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#11
A GTX 460 is probably enough. The 500 and 600 series are slightly more powerful but also a lot more money. See the comparison of the high end cards here: PassMark Software - Video Card Benchmark Charts
And this is a good PSU: Newegg.com - Antec EarthWatts EA-650 GREEN 650W ATX12V v2.3 SLI Ready CrossFire Certified 80 PLUS BRONZE Certified Active PFC Power Supply