Recommend a good graphics card for this motherboard?

Do NOT listen to Ed. That motherboard doesn't support SLI and he's either a green goblin fanboy or knows very little about motherboard chipsets. You need an ATi card on that board because you can't run 2 nVidias which defeats the purpose of having 2 card slots. You can't go wrong with a Radeon HD 4870. They're a great price for the performance they have and you can add one later and Crossfire them together in a year or two to increase performance again. They'll be like $50 by then. The Radeon HD 5870 is an awesome card but not worth the money yet because only one game can use that kind of power. When you get to the point that they do, adding another 4870 and crossfiring them will give you the power you need and will be a lot cheaper now and in the long run.