Cowboy Movies

I'm writing a truly warped heroine who developed her sense of justice and fair play from watching old cowboy movies while growing up. (Okay, so her childhood was warped, too!)  I need to sit down and refresh my memory on a few favorites. The Mavericks are permanently implanted my brain, so "fair play" has a pretty liquid meaning. "G"

Does anyone have a favorite old western, scene, or actor that you can recommend?