Radeon 98xx, 4670, 4770, 5850 and Geforces 6600GT, 9600GT, GTS 250, GTX 460 1 GB.
Nvidia seems to always do an excellent job on mid-range parts. While ATi never really has the best all out performance on their top end, since R700 they by far tend to be better as far as FPS/$ goes compared to Nvidia's higher end stuff.
I wish I still had all my previous graphics cards from years past, just to see how they would do against today's games. I've had quite a few tiers of graphics being both a multi-desktop and notebook person.