I like the ones I watch to have at least a semblance of authenticity to them. I have never been able to stomach any of the spaghetti westerns.
My favorites, not in any particular order - with comments
Appaloosa - a darned good one, it didn't drift too far from the book but I wish that they had put just a few more backgound details in it.
The Rounders - a great western, I have known characters like those two all my life, well played.
Tombstone - Kurt Russel and Val Kilmer made it a very believeable and enjoyable movie.
The Big Country - Entertaining, all of the characters were very well played especially the one played by Burl Ives.
True Grit - the John Wayne version was entertaining but the Jeff Bridges version caught the feel of the book and the era.
The Searchers - great acting and scenery, a little hokey at times but still the best acting job John Wayne ever did.
The Man Who Shot Liberty Valance - great movie, great acting by everyone in it.
Will Penny - another under rated movie, probably a little too true to life for most folks.
Open Range - probably the best movie Costner made, especially the gunfight at the end.
Lonesome Dove - the movie was better than the book, a rare occurance.
Monte Walsh - Jack Palance & Lee Marvin version - another great movie.
Tom Horn - slow but good.
Ulzanas Raid - great movie, one of the best Burt Lancaster ever did.
Red River - John Wayne as a very dark character - excellent.
The Gray Fox - about the last train robbery - interesting story and the star is Richard Farnsworth likely hard to find but it is worth it.
drover
+1 on the Gray Fox
