Ready for my list? Not all of these are "must own" movies, but there's
a bunch here that I like:

Terry Gilliam Flicks:

 - Time Bandits
 - The Adventures of Baron Munchausen
 - Brazil
 - The Fisher King
 - 12 Monkeys

Quentin Tarantino Flicks:

 - Killing Zoe
 - Reservoir Dogs
 - Pulp Fiction
 - Jackie Brown

Cohen Brothers Flicks:

 - Raising Arizona
 - The Hudsucker Proxy
 - Fargo
 - The Big Lebowski

Christopher Guest Flicks:

 - Spinal Tap
 - Waiting for Guffman
 - Best in Show

Action / Hero Flicks:

 - Any Bond flick
 - Any Indiana Jones Flick
 - Long Kiss Goodnight (good show, you should see it if you haven't)
 - Desperado (gotta love Antonio Banderas)
 - Bad Boys
 - The Replacement Killers (Chou Yun Fat is cool)
 - Last of the Mohichans
 - Braveheart
 - L. A. Confidential
 - Ronin
 - The Professional

Campy / Humorous Flicks:

 - Evil Dead II
 - Army of Darkness
 - Big Trouble in Little China
 - Galaxy Quest
 - Mystery Men

Fantasy Flicks:

 - LadyHawke
 - Dragonslayer
 - Willow
 - Never-Ending Story (Lisa likes it too)
 - LotR: FotR, TTT, RotK

Sci-Fi Flicks:

 - Gattaca
 - The Matrix
 - Blade Runner
 - Fifth Element (not Oscar material, but I like it anyway)

Others:

 - Fandango
 - Fight Club (a movie that's hard to classify)


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And while we're at it, I'll list some of my fav actors:

 - Samuel L. Jackson
 - Morgan Freeman
 - Denzel Washington
 - Sean Connery (back in the day *sigh*)
 - Harrison Ford (also back in the day)
 - Madeline Stowe
 - Sigourney Weaver (probably my favorite actress of all time)
 - Bruce Willis
 - Angela Basset
 - Brad Pitt (yes, really)
 - Val Kilmer
 - Mel Gibson
 - Sophie Marceau

Favorite British Actors:

 - Emma Thompson
 - Steven Fry
 - Hugh Lorrie
 - Rowan Atkinson
 - Judy Dench
 - Johnathan Pryce
 - Minnie Driver


Ocassionally good, kind of spotty
 - George Cloony (not a big favorite, but I like his goofiness)
 - Keanu Reeves (I actually like him)