It's been a while since I watched Citizen Kane, but my favorite Orson Welles is either Lady from Shanghai or Touch of Evil. I still haven't seen The Trial, The Immortal Story, Falstaff or the other Shakespeare films. Magnificent Ambersons does not withstand the cuts and reshoots.
Once Upon a Time in the West is Leone's best.
My votes are for
Jaromil Jireš - Valerie and Her Week of Wonders
David Lean - Lawrence of Arabia
Fritz Lang - Metropolis
Fellini - 8½
Harold Ramis - Groundhog Day
Fernando Meirelles - City of God
Charles Laughton - Night of the Hunter