LOL- Dave, you 3dfx engineers screwed up! The lowly MX besting the v5?!
Heehee, I have to agree with you this is not true.
Original poster- I would say the GTS is more "future proof" in that nVidia is still making drivers, which may address game incompatibility and performance issues as new games are released.
The GTS should be faster than the V5 in general, and at the $100 video card level I don't think you get to have ultimate image quality/speed/FSAA/feature set. (otherwise the card would cost more)