Spielberg - Scorcese - Bay - Kevin Smith and Clint Eastwood Really there are to many my wife says I love movies to much I have seen every movie that has won the Oscar except Slumdog but I will be seeing it soon enough right now I am in to comic book movies I own them all
(in order of what comes to mind first.)
The Coen Brothers
I've had my ups and downs with Tarantino, but I think he should be on my list too.
Kevin Allen (The only Welsh film director I could think of, not one of the greats but if you like your black comedy his film Twin Town is well worth a look!)
George A. Romero