While there is a lot to like in the Russell Crowe/Christian Bale film, I will have to give the nod to the Glenn Ford movie. (Glenn Ford bore a striking resemblance to my father, who called him "my twin." They were about the same age, and died the same year.)
Here are mine:
The Searchers
A Fistful of Dollars/For A Few Dollars More/The Good The Bad and the Ugly
Butch Cassidy & The Sundance Kid
The Wild Bunch
Silverado
Blazing Saddles
Unforgiven
Jeremiah Johnson
Django Unchained
The Three Burials of Melquiades Estrada
The Electric Horseman
Honorable...