Tom's Hardware is also packed with good info and reviews.
http://www.tomshardware.com/charts/graphics-cards,1.html
http://www.tomshardware.com/charts/graphics-cards,1.html
I recommend a radeon 5670 or something similar. Its not the latest and greatest but it supports direct X 11 and doesn't require additional power hook ups.
depending on your OS, Xp doesn't support direct x 11 or 10. You'll need vista to run 10 and win 7 to run DX 11..
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