I have K6-2+'s and K6-3+'s running Voodoo 2 SLI and a Voodoo 3 3000.
I also have a 233MMX with a PCI Banshee in it, and a lowely 386DX40 with a ISA Trident TVGA 9000C in it.
stashed away in my parts boxes I have ISA, VLB and PCI Tridents, Tseng labs, S3 and Cirrus logics as well as many other things, like my more modern stuff like TNT2's, GF2's, GF3's GF4's and ATI's from Rage 2c up to 9000 pro's...I will use most of it one day.
My Favorites that I've owned over the past 15 years or so are as follows.
Trident TVGA 9000C 512kb , that gave me my first decent VGA on my old 386DX
Diamond S3 805 VLB 1MB, it was built in to the mobo of my Osborne 486SX with an Overdrive socket, that rig kicked ass once I added a Hyperace Am5x86 133 overdrive chip to it, it used to run Quake pretty good.
Creative 3D BLASTER VLB 4MB....see rig above, Vquake was a blast...and none of my friends had true 3D acceleration in their early Pentium rigs.
My trusty Powercolor Voodoo 2 SLI, it made my K6-2 400 in to a real power house, it used to pull over 60FPS in Q2 at an awesome 1024x768, I still have this rig, and it ocassionally gets a work out.
3DFX Voodoo 5 5500, that worked pretty good in my K6-3+ 550 rig, I choose it over a GF2 GTS because of power issues with my GA-5AA motherboard...I discovered later on that a GF2 GTS would work if I set the mobo up for AGP 1x which seemed to solve all of the AGP power issues.
GF3 TI200@TI500, that card was awesome in my Athlon T-bird 1.4ghz....it ran RTCW and UT2003 with no problems at all..I wish I still had that setup in my collection.
Radeon 9700PRO....what other video card would last 3+ years with out the need for an upgrade, I still have that in my AXP 3000+ server, runs just as good as the day I bought it in late 2002.
GF6800GT, it's not that old but it's done the job up until last week when I replaced it with a BFG 7800GS...now it's gets a run in my P4 3.45ghz rig.
BFG 7800GS@550/1350 what can I say I'm really impressed with this card, it gets over 15300 in 3DMark03 and 7500 in 2005....runs FEAR XP and prey pretty good....with most details set to high.