Go for the Radeon 9800 Pro. The cheapest one will do. Make sure it has 128 MB of memory on it and that the memory interface is 256-bit. DO NOT buy the 128-bit memory interface version...it's gotta be 256. Yes, they are different manufacturers. Just buy the cheapest one with the aforementioned specs. 
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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