I like a broad spectrum of movies. Everything from Japanese kaiju to documentaries to blockbusters to indies to silent to total fluff. I useta work in the movie department at Media Play and later at Suncoast, like ten years ago. My faves:
Original Star Wars Trilogy - Nothing will ever beat it for me, and Empire is my favorite.
Raiders of the Lost Ark & Indiana Jones and the Last Crusade - Temple of Doom was okay but these two rank way up on my all-time list.
Lupin the 3rd: Castle of Cagliostro - Brilliant and wonderful escapism with classic anime characters Lupin et. al.
Sneakers - This isn't one of those movies that most people would watch over and over, but I can't get enough of it.
Patlabor: The Movie and Patlabor 2 - Patlabor is my favorite anime, and although the first two movies were way different in tone than the OAV and TV show, they're both intricate conspiracy plots that I find absorbing.
Kurosawa films - Seven Samurai, Yojimbo, Sanjuro, Ran, Kagemusha - I love his samurai stuff of course, but beyond those I also love High & Low and Dreams. I am still working on seeing all of his stuff.
Hitchcock films - Rear Window and North by Northwest are probably my favorites. Like Kurosawa, I'm slowly chipping away at his entire body of work.
Blazing Saddles and Young Frankenstein - might as well be the beginning and end of Mel Brooks' career (although The Producers was good too), these are two of the funniest movies ever.
The Kentucky Fried Movie - ZAZ's first feature film. Still almost makes me pee myself laughing. Airplane! is up there too.
This Is Spinal Tap - How much more black could it be? The answer is none. None more black.
Hellraiser and Hellbound: Hellraiser II - My favorite horror movies. 3 sucked, 4 was not bad, 5 made me mad and I haven't seen any of them since. But I love the first two.
Alien - The first one was the perfect mix of sci-fi and horror, chock full of Giger designs and Ridley Scott's bizarre style of direction which gave it an almost documentary-like realism.
Blade Runner - Just gets better every time I see it. The Director's Cut is better than the original.
Classic Universal monster movies - All of 'em, from Frankenstein to Dracula to Creature from the Black Lagoon. Classic, engaging and tons of fun.
Godzilla - I own every single one and I know them backwards and forwards. I can't even remember how young I was when I got into Godzilla or what the first one I saw was -- Godzilla has been a huge part of my life for as long as I can remember.
King Kong - The original 1933 version of course, not the useless '76 remake. The cornerstone of all sci-fi, fantasy, and horror collections. Though I'm usually wary of remakes of my favorites, Peter Jackson's upcoming Kong looks like he actually may have done it right.
Sin City - A recent entry, but as a huge fan of Frank Miller and the Sin City comics, this movie just made me happy. And I can't wait for the special edition DVD, which will feature all of the stories in their complete forms, as they were in the comics.
Honorable mentions: Ray Harryhausen movies (Beast from 20,000 Fathoms, Earth vs the Flying Saucers, etc), Marilyn Monroe movies (Seven Year Itch and Some Like it Hot are my favorites), silent German horror and fantasy (Nosferatu, Metropolis, Cabinet of Dr. Caligari, and one of the most amazing movies I've ever seen, Fritz Lang's 5-hour Die Nibelungen), Ghostbusters, Lost In Translation, Monty Python and the Holy Grail and Life of Brian, the original War of the Worlds...um...um...um...
Oh, and just to join the conversation, I've seen Herzog's Incident at Loch Ness. I thought it was alright. I'm not too familiar with his other work though -- all I've seen was his remake of Nosferatu and I didn't care for it much. And I like Italian horror too -- the original Zombi is in my collection, and sometimes goddammit ya just need a good cannibal flick. The new Dawn of the Dead was very good, as was 28 Days Later. Shaun of the Dead is hilarious.
I gotta stop, I'm gonna be late for work...