It depends on what your doing. I use win2k and capture/edit video with my AIW radeon. I myself use it with Adobe Premiere as my editing solution and it works great. I find that my 650 Duron just doesn't the have power for Highest quality mpeg-2 captures, so I'll be upgrading to a T-Bird 950+ soon. It captures uncompressed AVI great, and is very capable at mpeg-1 and mpeg-2 with the right hardware.
I would recommend the AIW Radeon and I've found the drivers work well in Win2k and is a very versitile card. If you need to do something specific, there maybe better ways to go, but for a great, do everything well card, get the AIW.