The purchase of a 3D Blaster Banshee 16MB SDRAM AGP Graphics Accelerator with 16 MEG of RAM was the single best gaming investment I ever made!
The card combined the 128 bit Voodoo 2 chipset with a fast 2D card - 12 MEG being allocated to the 3dfx and 4 meg to regular (2D) graphics.
It turned my modest Pentium 233MMX into a screaming graphics machine, with all the great Voodoo graphics effects and a silky smooth frame rate on most sims.
Update: The Banshee now supports MULTI MONITOR in Win 98 - meaning you can run another graphics card on a second monitor. You will need to install a .dll file to enable multi monitor.
3D Blaster Banshee 16MB SDRAM AGP Graphics Accelerator with 16 MEG of RAM