Skip the V3.
With todays video cards, game makers have given up on the V3.
A good example of this is the new and improved Links 2001, which finally added 3d!!
Problem is, the V3 series, (as well as the V1 and V2), will not run in 3d mode with this game. Seeing as 3dfx is no more, they have no reason to try to get it working with the V3.
A Celeron 500 doesn't have much usefull gaming life left, so a motherboard upgrade will probably not be too far off for you. Even some of todays games will bring a 1Ghz CPU and GeForce2 GTS card to it's knees, if all the options are cranked up. With that in mind, you may want to get the most powerful PCI card you can find, so that your next system will be ready to go. If you are are not concerned about the future, and you like 3dfx, they were the kings of PCI, and the 5500 will work good today. GeForce2 MX cards are about 1/2 the cost, the company isn't gonna fold anytime soon, and performance is right up there.