3dfx Voodoo (I think it was the first release which really stood out)
ATI Rage series (never owned one so couldn't tell you the best one)
Nvidia Riva TNT 1 & 2 (Was considered the Voodoo beater at the time)
Nvidia GeForce 256 and GTS (MX cards were good also)
PowerVR Kyro II (Was able to rival the Radeon and GeForce cards)
Nvidia GeForce 3 (Promoted lots with Doom 3 and was the only card that could play it with decent graphics at the time)
Nvidia GeForce 4 Ti 4200 and 4600 (MX cards were good also)
ATI Radeon 9xxx series (9500, 9600, 9700 and 9800 all brilliant cards)
ATI Radeon X1000 series (X1800, X1900 and X1950 all brilliant cards)
Nvidia GeForce 7 Series (7800 GTX, 7900 GT/X>O, GX2)
Nvidia GeForce 8 Series (GT, GTS, GTX and Ultra)
Nvidia GeForce 9 series (only one worth mentioning in my opinion: GX2)
ATI Radeon HD 4xxx series (4830, 4850, 4870, 4890 and X2)
Nvidia 200 series (260, 275, 280, 285, 295)
ATI Radeon HD 5xxx series (5770, 5830, 5850, 5870, 5970)
Nvidia 400 series (460, 465, 470 and 480)
ATI Radeon HD 68xx series (6850, 6870 - worthy mention mainly for CF)
Nvidia 500 series (570, 580 and 590)
ATI Radeon HD 69xx series (6950, 6970, 6990)
I deliberately missed some out as I felt that some just weren't
that great. I may have missed some really worthy mentions though too, but forgive me as this was rushed.