Well, as you can tell from the Quake2 scores, the 3500TV takes the TNT2, slaps it, and calls it it's own. We have never seen a card so blindingly fast under the Quake2 benchmark. Even under the high quality mode, the TNT2 Ultra just can't keep up.
Under Direct 3D, however, the story changes. The higher scores are consistently held for 3Dmark by the TNT2. I suspect that this is largely due in part by the PIII (since 3DMark takes advantage of the PIII SIMD instruction set) optimized detonator drivers that were used. Although in Forsaken, the V3 is the clear leader at the lower resolutions. In the future I would suspect that this gap will either get more narrow or even totally surpassed by the 3500TV as newer drivers are developed.
So, I guess if you play more games that use OpenGL, than this card is your ticket. If you play more games that use D3D, then you'd probably want to look at the TNT2 Ultra for now. I don't say this to try and turn this into a V3 vs. TNT 2 review, however it is important info to consider as you make your video card selection.