Man, seeing all these cards brings back memories.
Diamond Monster 3D II (3dfx Voodoo 2) + S3 Virge
I build my first own PC in 1998, and the Voodoo2 came with a copy of Need for Speed II, which looked absolutely mindblowing at the time.
Nvidia Riva TNT2
I got it second hand, but I remember it not being that much faster than my previous setup. I didn't own it very long, because I soon upgraded to...
Nvidia Geforce 2 GTS
One of my favorite cards ever. I got this new at some PC hardware expo in 2000, back when those things were still around. I must have played thousands of hours of Counter-Strike on this thing.
ATI Radeon 9800 Pro
Played a lot of Xbox in the meantime so hadn't upgraded in a while, but then I bought the 9800 Pro. Now this probably was my favorite card ever. I bought it pretty late in its lifecycle in 2004, for Doom 3. It was crazy value for the money and served me really well through Half-Life 2, CS:Source, Far Cry and all the other great games that year as well.
ATI Radeon X1950
An alright upgrade, but I remember it being noisy. It didn't benchmark all that well against the competition either. I guess I was kinda an ATI fanboy at this point.
ATI Radeon 4870
Very powerful card, but also too noisy for my tastes. I was getting really annoyed with hearing a leafblower anytime I played a game. Could be because I bought the cheap Sapphire models.
ATI Radeon 5770
Basically the same performance as the 4870, but significantly quieter. I was pretty content with it while I played more Xbox 360 / PS3 during this time.
Nvidia Geforce GTX 660
My first Nvidia card since the Geforce 2, and also bought mainly because of its quietness and good price. I'm quite happy with it and in no rush to upgrade right now. Although I have to say the much talked about difference between Nvidia's drivers and AMD's drivers are incredibly overblown. Both have their issues.