My Favourites (not necessarily "bests", but films I watch again and again):

1/  CITIZEN KANE (The best ever, but SO MUCH FUN!  "There is a man/One certain man/And for the poor/you can be sure/he'll do all he can..."  I'm listening to it now, at the video store I manage)
2/  MY DINNER WITH ANDRE (because it changed my life)
3/  BRINGING UP BABY (pure anarchic insanity.  The funniest film I have ever seen...again and again and again...)
4/  DUCK SOUP (for the same reason as #2, it's just NOT as good)
5/  MACCABE AND MRS MILLER (A film so beautiful its imagery can actually make me weep!  That zoom into Beatty's face when the slow witted hooker says, "I have to go to the pot", is pure poetry.  The best American film of the '70's as well as the most humane)
6/  A NEW LEAF (Elaine May is a genius and although I like "Mikey And Nicky", this film floors me every time)
8/  LOLITA (not Kubrick's "best", but hysterically funny and extremely intelligent.  Shelly Winters rocks my world!)
9/  NEXT STOP WONDERLAND (Brad Anderson's 1998 film was a film that I watched with zero expectations, but was truly bowled over by it.  A "minor" miracle)
10/  THE PHILADELPHIA STORY (Everyone was firing on all cylinders in this one, none more so than Cukor, a good director, who cexecuted a great film)