The “ATI 3780 Mac & PC Edition” is probably the best choice. On paper it’s similar in performance to the 8800 and it’s priced about the same – however Color and Motion are optimized for ATI cards, not Nvidia, so those apps benchmark much better.
I recently made the mistake of buying an 8800. Because the 3780 is ATI branded, not Apple, it flew under my radar.
Sean