I am not familiar with the Viper2, but if it supports 3d in 32bit color, it is a better choice.
Reason being, some newer games that use 3d will only work if your card supports 3d in 32 bit. I found this out the hard way with the V3. Links 2001, a Microsoft golf game, has finally added 3d to this great series. Problem is like I said. Since the V3 only supports 16bit 3d, then it only works in software mode with this 3d game. But, if older games is all that this will be used for, then the V3 is a great choice if it's under $35 (used). Anything more than $35, and you might as well spend $80 and get a "new" GeForce2 MX card.
In terms of driver support, the V3 has NO future.