Here be my favourites. No particular order:
Mel Brooks (great spoofer and great comedy and really love most of his film work, the only exception being High Anxiety)
Quentin Tarantino (absolutely in love with the Kill Bill movies)
Robert Rodriguez (have always been in love the Desperado films and his persistence)
Penelope Spheeris (a chick in a man's world, did a great job with Wayne's World)
Kevin Lima (does great Disney live action films, especially Enchanted)
George Miller (seriously is easily one of the best Australian directors and is one who has crossed the divide well between Hollywood and Australia)
Maya Deren (she's a true artist and yeah, pretty eccentric)
Alfred Hitchcock (and Alma Reville-Hitchcock, after doing research on Hitchcock's life and work, I found that Alma was a very big influence and decision maker for Hitch).
Michael Pattinson (another Australian director who has crossed the divide and was my Directing lecturer for a semester. He disappeared onto a project a short time after. He taught me a whole lot!).
Steven Spielberg (He's a master when it comes to the balance of great camerawork orchestration and acting. I personally prefer his older films.)
Phillip Noyce (another great Australian director, has crossed the divide well and both old and new films are quite good)