What single GPU would you guys recommend for gaming on a 2560x1600@60Hz monitor? I have set aside some money to buy my brother a new graphics card for his gaming rig. His birthday is coming up and he's been wanting a new GPU for some time now. As he's been a remarkably good kid lately, I'm thinking I should get him something special. Given the resolution of his new monitor, I figure something with some extra VRAM would be good. I can spend around US$500, maybe a bit more, for the card. My brother currently has a GTX 580 running with an i5 2500K@4.5Ghz on an Asus P8Z68 Pro Gen 3 motherboard. He plays a wide variety of games -- BF3, Borderlands 2, WoW (I think), Civilization, some obscure titles, etc. I should mention that he's not inclined to go 580 SLI -- or any dual card set up, for that matter. I've got a few cards in mind. But I do not want to jump the gun (as is my habit), and since you guys know more about these things than I do, I would really appreciate your advice. Thanks in advance for your help.