As Dues mention 'How The West Was Won' is a great movie. I like the John Wayne movie "Cowboys" where he takes a bunch of kids on a cattle drive.
'Tombstone' is always worth a watch. Lots of good one liners in that movie as well. I liked 'Wyatt Earp' with Kevin Costner. Based on the same story as Tombstone. Some people don't like it but I do.
I'm sure there are others I'm forgetting. If I think of another I'll let you know.