Here's how the prices break down:
3dfx Voodoo4 4500 AGP - $115
ATI RADEON DDR 32MB - $150 after $50 rebate (retail from certain stores only)
ATI RADEON SDR 32MB - $135
ELSA GLADIAC MX - $120
Hercules 3D Prophet II MX - $150
Leadtek WinFast GeForce2 MX - $130
Matrox G450 - $160
MSI MS-StarForce 816 - $115

We ran into no stability problems whatsoever. All the cards worked without crashing. There were some graphical glitches experienced intermittently under Windows 2000 but as all the drivers for Windows 2000 evolve, that should diminish.