Three most standout cards are clearly the 3dfx Voodoo Graphics, ATI 9700pro and Nvidia 8800gtx IMO:
Voodoo1: First proper 3d card that made gaming at 512x384 feasible, good range of game support (glide/d3d/miniGL).
9700pro: First dx9 card, outstanding performance, no idea why the 9800pro gets so much love considering it was nowhere near as revolutionary and game out a while later
8800GTX: First 'proper' dx10 card i.e. giving decent performance, very good allrounder due to 0.75GB VRAM, people who got one in late 2006 could get away with using it for a good 3 years
Honorable mentions to GTX280 (price fell very rapidly making it a snip at ~£240, again an excellent allrounder due to fast bus, 1GB VRAM etc, no weaknesses, it lasted me longer than any other gfx card) and Geforce DDR (seemed a bit pricey to me at the time but having DDR memory gave it a massive boost, would leave gf2mxs in its wake).
As for Secret Window's list, it's hard to take it seriously when it list ATI Rage series. The only semi-plausible card for gaming was the Rage Fury MAXX, a dual-gpu card which was still slower than Geforce.