I'd get either the GeForce 7600 GT for $125, or the Radeon X1950 Pro for $175. The Radeon X1900 GT used to be the best for $150, but it looks like NewEgg dropped the model at that price.
PS: the memory on the videocard doesn't matter. Having 512 MB of ram on a videocard is the LAST thing you want to care about when determining which card you want. Memory on the videocard has negligible effects on performance above 256 MB unless you're running a $3k computer.
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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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