Gilda Radner deserves a mention. Bob Hope probably deserves a little more love, too. A better one-liner comedian than Rodney Dangerfield (and one-liners were Dangerfield's whole act). Billy Crystal was really funny, too.
I went with Chappelle, and Robin Williams would be next on my list (regardless of Hope or the women who are missing).
Kaufman never worked for me, but he certainly understood his act and people loved it.
Eddie Murphy was definitely good--but not Mount Rushmore good. I feel similarly about Seinfeld--he's really good at observational comedy, without relying on shock value. That's impressive, but not Mount Rushmore impressive.
Shock value is a big thing in comedy. When I was a kid, race and drugs were big topics. Nowadays sex seems to be a big, driving force.