Best Western I've ever seen
I grew up watching all the Saturday morning "B-movie" westerns on TV and have always enjoyed a good western. All the one's mentioned so far are enjoyable movies. I love anything done by the Duke, John Wayne.
But don't forget The Magnificent Seven which first came out 51 years ago with Yul Brynner, Steve McQueen, Charles Bronson, James Coburn, Robert Vaughn, Brad Dexter, Horst Buchholz and Eli Wallach. Great musical score by Elmer Bernstein - later used for Marlboro cigarette commercials. Although a great western, it was based very closely on Akira Kurosawa's movie, Seven Samurai, that was released in 1954 and based in 16th-century Japan.