The world as a whole has yet to unveil what is in store for the low-end 3D accelerator market. Matrox is on the verge of releasing their G200 based cards which promise to be decent performers, 3Dfx recently announced their Banshee chipset which should provide performance almost equivalent to a single Voodoo2 at a fraction of the cost while integrating an excellent 2D processor as well.
But for now...the best overall low-cost Super7 3D Accelerator? The nVidia Riva 128, unless you happen to be using a Cyrix 6x86MX in which case there is no point upgrading beyond a Voodoo 1 card. This just goes to show you that you don't need to add $500 to the cost of your computer to get decent gaming performance, although from one hardware junkie to another...Dual Voodoo2's are definitely worth it ;)