My list would be real similar... I'd pull Nicholson's Joker, Nurse Ratchet, The Headless Horseman and Dennis Hopper, but add
(J.E. Freeman??? Is that his name?) Eddie Dane from Miller's Crossing
"Why Would Einstein want to talk to a gorilla? So I grabbed the gorilla... And I made him Talk..."
Jack Palance as Jack Wilson from Shane
(Can't recall a quote... But his best scene involved him slowly putting his gloves on and coldly gunning down a rancher. )
Lee Van Cleef as Angel Eyes The Good The Bad And The Ugly
"When I'm paid, I always follow my job through. You know that."
Tererance Stamp as General Zod in Superman I & II
"This "Super" man is nothing of the sort. I have deduced his weakness. He ACTUALLY cares for these humans." or of course "Kneel before Zod"