Hard choice, so many had such great one liners

The Undefeated
when asked "You went out there to talk. Why did you have to shoot the man?" Wayne " Well m'am the conversation just sort of dried up"
True Grit
Duvall" I'd call that mighty bold talk for a one-eyed fatman, Rooster"
Wayne. "Fill your hands you son-of-a-bitch"

I could go on for a long time on this thought, but after having read Charles Portis' book "True Grit" the screenplay was a perfect adaptation.I have to say "True Grit" I thought it was weak at the time but it has held up extremely well.
Also

Rio Lobo
just love the cast of characters especially Jack Elam

McClintock
the mud fight

I really just like them all, some are just better than others.
John