Don't know how I managed to post the above, but I wasn't ready to. My list continues:
The Outlaw Josie Wales
Shane
Westward the Women
Bad Bascomb - an obscure movie with Wallace Beery, one of my favorite actors.
Any other western with Wallace Beery
Treasure of the Sierra Madre
My Little Chickadee - it takes place out west, so it's a western.
True Grit, dispite the fact that Glen Campbell's acting was so bad, he couldn't convey the concept of falling if you pushed him off a cliff. (Not mine, I stole it from Dave Barry).
Quigley Down Under - ok, it's an Australian with an AMerican cowboy, it's an almost-western. Alan Rickman is the villain, and I'm starting to believe that anything with Rickman is worth watching.
There are more, but I can't think of them right now.