I was most impressed by the original 3dfx Voodoo and acclimated me into a PC gamer for life.
^This
Nothing like going from Quake to GLQuake. Oh and how awesome it was when you found a game that would run on Glide.
Bought way too many video cards over the years, somehow missed the 9700 everyone is always talking about.
The list: AIW 9000pro, 9600, 6800, AIW x800, 7800GT (liked it), x1950xt (too loud), 8800GTS, 2600xt, 8600gt, HD 3850 (really like the way it did theater mode w XP), HD 4850, HD 5770, to dual 5770s, several 9800GTs (compute only), several GT240s (compute only), GTX 460 (compute only), GTX 465 (compute only), GTX 570 (compute only), HD 6950, to dual HD 6950s, and finally to a HD 7850...Somewhere back there was a 4200Ti and a couple Voodoo cards and a very expensive Diamond Viper V770 nVidia Riva TNT2 AGP (I think, some Diamond Multimedia card anyhow).
My favorites are the first and last. The Voodoo and the HD7850, the rest are mostly just a blur.
The MSI N465GTX Twin Frozr II GE GeForce GTX 465 was one of the best deals because it was really a GTX 470 card with an awesome copper cooler for only $287.86.