I agree with Deeko, except that with 3dfx out of business I'd be leary of a V5....no driver updates would suck. Sure the drivers are good now, but what happens when you want to move to whistler? Or DX9? I just don't like no driver support...look at the Vortex2...friggin awesome board...but if you use Win2k you're screwed...
Radeon is an excellent board, I had the 64MB Vivo...but I had driver problems with it...I can't stand driver problems so I ditched it....I'd go for the GF2GTS, but the Radeon is also very nice, and has better image quality in both 2D and 3D.
Oh if you are a speed freak the GF2 is probably for you....