It depends on the resolution you are working at and also
What you are using it for.
For low resolutions (1280 by 1024) then a 4850 would be recommended
For high resolutions (1600 by 1200) and more then you could get a 4870 or GTX 285
But it all depends on your BUDGET.
A gtx 285 would be overkill, if you have the money get the gtx 260 c216 or 4870, if dont has as much, the 4850/gtx250/gtx9800+. look at benchmarks and consider how big of a monitor you will be playing at
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