Whew! Ya know, I've rarely bought more than 2 graphics cards from the same manufacturer back to back. The reasons being that I want the best bang for the buck but I also like making my rig into a guinea pig every so often. I've never bought more than 2 3Dfx cards before jumping to nVidia. With nVidia, I've purchased the G2MX, GF2 Ti, and my current Ti4200 so that makes 3 for nVidia.
However, I've never owned an ATi card...and I think it's about time I do!