I will echo Unforgiven (best ending action sequence ever!), Open Range, Tombstone, True Grit (I like most all John Wayne's movies, The Shootist may be my favorite), Silverado, the Spaghetti westerns with Clint Eastwood (The Good, The Bad, and The Ugly is perhaps my favorite), The Magnificent Seven, Once Upon a Time in the West, Maverick, there are lots!