If you can get your hands on one, go for a 5850. Performs well, overclocks great, Doesn't consume all that much power. Also has DX11 support and would do excellent possibly in crossfire in the future for that resolution.
What is the native resolution, that is probably more important than screen size. I'm guessing 1920x1200 or 1920x1080. The 5850 is faster, and DX11, it is the obvious choice IMO.
Native res is 1920x1200 and my 512mb 4870 is still doing a very good job at this res but specially in some games I also want to max out AA so I want to upgrade.
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