I've just ordered Metropolis, Seventh Seal, Seven Samurai and Battleship Potempkin.
Largely for my own reference, here's a list of directors I know I like at least some of their work. Please suggest any that obviously should be on such a list.
Darren Aronofsky
Matthew Barney
Ingmar Bergman
Bernardo Bertolucci
David Cronenberg
Joel & Ethan Coen
Sergei Eisenstein
Federico Fellini
Jean Luc Goddard
Michael Hanaeke
Alfred Hitchcock
Jean-Pierre Jeunet
Takeshi Kitano
Stanley Kubrick
Akira Kurosawa
Fritz Lang
Sergio Leone
Richard Linklater
David Lynch
Roman Polanski
Steven Soderbergh
Andrei Tarkovsky
Lars von Trier
Tom Tykwer
Wim Wenders