Updated!!!!!!!!!!!! The new GeForce GTX 275 and Radeon HD 4890 are now on the list. They are good choices if you really want to keep a single GPU card. The Radeon HD 4850 X2 is a dual-GPU card, but fits in a single PCI-E slot so it doesn't require an SLI/Crossfire power supply and is better performing in most tests, so if you are up for a single card/dual GPU card then that is the best choice still.
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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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