I wish it was even possible to remember all of them.
First graphics card I bought specifically to increase quality of games (for things like, X-Wing and Doom 1) was a Diamond 32 VLB (vesa local bus, omg! not even all motherboards had VLB slots at the time heh) for about 120 quid at trade prices (145ish retail). The ONLY memorable card to top it at the time, was the original Matrox Millenium that people were buying for use with autocad (the DOS version).
I remember also my:
Orchid Righteous 3D (4mb voodoo 1, 2mb was for framebuffer, 2mb was for texturing - was 165 quid when it came out if memory serves me)
Matrox Mystique
Diamond FireGL (64? a Permedia 2 chip based opengl graphics accelerator)
Creative Labs Voodoo 2 12mb x2 in SLI (200 quid a pop, think I bought some for my brothers on their birthday too, and loaned a mate the cash for one because if he bought it and his wife noticed a lump sum payment on a computer for that amount, she'd have killed him.. he paid me back in bi-weekly installments heh).
Matrox G400 (imported this bastage from Canada directly from Matrox and got hit with insane import duty rates)
Nvidia Ti4600 (bought 2, one for each machine I was running)
Nvidia FX5750 (from here onward, bought 1 card at a time and old machine got hand-me-downs whenever I upgraded - also a bit of a budget card this time, compared to the previous Ti's which were premium cards of their time)
Nv 8800 GTX
Nv 460 GTX (pretty good hand-me-down to have right now methinks!)
Nv 580 GTX 3GB - to satisfy my stereo3d urges
I reckon on having forgotten some older cards from the batch, these were the most noteworthy. The FireGL card I remember was just to have non-Glide based hardware acceleration of games like Quake, because Glide used a form of compression on the textures that was quite lossy. I don't think I really stuck with the card that long in the end, but it had some impressive moments.