Er. Sorry. I guess i worded myself wrong. Thats my CURRENT resolution with my shitty graphics card. It's like a GeForce 6200. I want the best i can get for around $500.
Still goes the same, a GTX 560 Ti is really good at 1980x1080(which is your highest resolution).
And if you are not pleased with it just SLI another 560 Ti, but if you like single's, then I guess you could do the GTX 570.
Trust me, A GTX 560 Ti maxes out almost every game today, except for maybe Crysis 2 DX11 and etc.