Chronological:
1) Nvidia 8MB Vanta integrated
2) 3DFX Voodoo 4 32MB PCI
3) Hercules TNT2 32MB PCI
3) Hercules Geforce 2 MX 200 32MB PCI
4) ATI Radeon 8500 64MB AGP 4x
5) Gainward Geforce 3 Ti200 64MB AGP 4x
6) Connect3D Radeon 9500 *unlocked* 128MB AGP 8x
7) eVGA Geforce 6800 128MB AGP 8x *unlocked*
8) XGI Volari 3 128MB AGP 8x
9) Nvidia Geforce 6800U 256MB AGP 8x
10) Asus Geforce 6600 128MB PCI-e
11) Leadtek Geforce 6200 *unlocked* 128MB PCI-e
Damn. No wonder I can't afford college
Favorite three:
1) Connect3D Radeon 9500 *unlocked*
2) eVGA Geforce 6800 *unlocked*
3) 3DFX Voodoo 4
The first two should be self explanatory (Hint: see asterisks)
The 3DFX card because it was the first real GPU I ever had. That turned me into such a huge 3DFX fanboy.