Another one in that same genre that was not mentioned anywhere, Hombre, with Paul Newman. That's an existentialist western if there ever was one.
However, the one that I will watch whenever it is shown is The Outlaw Josey Wales. The action and the humor in that film never disappoint. Casting Chief Dan George was a stroke of genius.
Chief Dan George was also in Little Big Man. Pretty much playing the identical character. He announced, “Today is a good day to die”. Then he climbed up onto his raised death pyre in open air,........ but when he felt a drop of rain he changed his mind. Movie legend has it that the Klingons got that phrase from Chief Dan George in that movie.