I've seen the complete works of a lot of directors (or at least have seen all their major films.)
I'm currently working on Lars Von Trier.
I've seen most of: Kubrick (Killer's Kiss is, I believe, the only one left), Cronenberg, Alejandro Jodorowsky (Can't WAIT for the new film King Shot. It's got Marilyn Manson in it), Brian DePalma, Frank Capra (bit Capra fan. It happened one night was awesome), DeMille, John Waters (Cecil B. Demented ranks on my top 50 easily), Wes Anderson, Todd Solondz (Happiness!), Takashi Miike (Katakuris is great, but did you know it's a remake of the Quiet Family? I haven't seen the latter, but some people like it even better. Audition and Ichi the Killer are both crazy), Fellini, Bergman (Persona, The Seventh Seal are such wonderful films. Seventh Seal is very nihilistic, and I like that. Of course, that has been argued many times), Todd Browning (One of us! One of us! We accept you one of us!), Michael Haneke (Shoot me, but the remake of Funny Games was better), David Fincher (Benjamin Button...not a fan), Tarantino (although he now endorses Eli Roth, so I've lost some respect there haha), Soderbergh, Woody Allen (If you haven't seen Annie Hall you seriously need to. Some amazing quotes there.), Paul Thomas Anderson, David Lynch (Favorite Director ever...), John Carpenter (not the best films ever, but all entertaining), Dario Argento (**** yes!), Gus Van Sant (Elephant being probably the favorite there), Peter Weir (Picnic at Hanging Rock was the freaking best), Sofia Coppola (...did she do Virgin Suicides? Because that was amazing. Lost in Translation FTW), John Hughes (Guilty pleasure haha, favorite being the Breakfast Club), Ken Russel (The Devils is his best film), (Shymalan had so much promise...then he made lady in the water, the happening, and now the last airbender...oh jesus), Wes Craven (has some awful, awful movies, but even those are entertaining), Kevin Smith (not popular among the film buffs...), Harmony Korine (surrealism is awesome!), Larry Clark (Yes, I enjoy watching kids from the ghetto and their apathy-ridden lives...), and Ed Wood.