"Jeremiah Johnson"
...and some say he's up there still.
Doug
I'll have to jump on the Unforgiven bandwagon too, and throw in Crossfire Trail.
Nobody's mentioned the one with the best closing line ever: Quigley Down Under
"I said I never had much use for one. Never said I didn't know how to use it."
I really haven't met a western I didn't like. Quigley Down Under is probably my favorite.