The first thing to ask then would be the price range as well as size such as going after a 256mb if not spending more on a 512mb model. Then there would be the preferred VPU which could a Radeon if not NVidia. The reference guide at
http://www.mwave.com/mwave/deptvid.hmx? can give you an idea on a few cards where you can then search for reviews to see which one performs the best when compared to others. MSI always worked here while Asus held it's end. But that was what had been seen on an AGP not PCI-E type of swap out with 128mb cards at the time.