That depends on your price range. If your looking in the...ehh what 150-200 range or so I think nVidia solidly has ATI beat...those 7600 series cards are great for the money. However if you want to spend anymore I would say ATI. I love ATI and I've always been a fan of their cards and drivers, but nVidia rules the midrange right now.
EDIT: WOW heck nevermind, I had forgotten about ATI's new models....look at this X1950Prohttp://www.newegg.com/Product/...asp?...N82E16814102061
Don't think nVidia can beat that for the price range...
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