Stick with NVidia- you'll get more speed from your S3 by dropping it out of the window. Nvidia 6200, 6600, and 6800's are more cheaply available now, and if you are feeling flushed, get a 7800. If you are looking to be all professional, like, get an Nvidia QuadroFX series. BUT it will be brilliant at running your 3D apps, but crap at games. You pays yer money and takes yer choice.