I think most of the directors I love are hit and miss, so I will also list the films I love the most from them.
John Ford - The Searchers, Stagecoach, The Man Who Shot Liberty Valance, Wagon Master, The Wings of Eagles,
Sergio Leone - The Dollars Trilogy, Once Upon a Time in the West
Steven Spielberg - Duel, Jaws, Raiders of the Lost Ark, Jurassic Park, Close Encounters, Temple of Doom, E.T.
Alfred Hitchcock - Vertigo, Man Who Knew Too Much, Rear Window, Psycho, North By Northwest, Notorious
Ridley Scott - Alien, Blade Runner
Jonathan Demme - Citizen's Band, Melvin and Howard, Silence of the Lambs
Martin Scorsese - Alice Doesn't Live Here Anymore, Goodfellas, Taxi Driver
George Lucas - American Graffiti, Star Wars, THX-1138
Mel Brooks - Blazing Saddles, Young Frankenstein, Producers, History of the World Part 1
Miloš Forman - Amadeus, One Flew Over the Cuckoos Nest
Tim Burton - Big Fish, Beetlejuice, Batman, Batman Returns, Edward Scissorhands, Mars Attacks
Stanley Kubrick - 2001: A Space Odyssey, Eyes Wide Shut, The Shining
Robert Zemeckis - Back to the Future Part 1 and 2, Death Becomes Her, Cast Away
Walter Hill - Hard Times, Crossroads
The Coen Brothers - Raising Arizona, O Brother Where Art Thou, The Big Lebowski, Fargo, No Country For Old Men, True Grit