"The Shootist" is one of my favorites! Lots of great lines!
"Well, pardon me all to hell." (John Wayne when Cobb yells at him to get out of the way.)
"The old man ain't worth a bullet." (Ron Howard when Cobb pulls his gun on Books.)
if you're going for john wayne quotes, i'd have to say "Not Hardly" from big jake is one of my favourites. or from the shootist, "see that gun? make like it's your mother's nipple"