Currently use an ATI HD4870 (512mb). Ready for an upgrade.
System: e8400 @ 3.6ghz, 4gb ram, win7 x64.
Power Supply - I will need to update it, depending on what card I want. Have my eye on a 60amp single rail at newegg.
I run dual screens, 1920x1200 each. Typically I like to game in a window (1680x1050). I would like the single most powerful card I can get for ~$500 for this setup. Leaning toward the GTX580 but so many people say the CPU isnt enough for it...others say the CPU will be just fine.
If there is any question about bottlenecking, the GTX 570's are coming down in price and can be found for $310-$320 after rebates. Newegg has the PNY GTX 570 for $310 after rebate with free shipping, lifetime warranty, free HDMI cable, and free copies of Just Cause 2 and Mafia 2. The performance will be close to the GTX 580.