A lot of good films listed here, along with some really debatable ones. Black Rain? Demolition Man? Ladyhawke? Uh, well, I guess it's a personal thing. Some of my faves:

Samurai Flicks
Seven Samurai
Yojimbo
Ran
Taboo (Gohatto)
Sword of Doom (Dai-bosatsu tôge)

Sci-Fi Flicks
The Thing (Carpenter version)
Blade Runner
Mad Max 1 and especially 2
Alien & Aliens

Period Flicks with Lace and Cufflinks
White Mischief
Pride & Prejudice (BBC version)
Emma (BBC version)
Howard's End

War Flicks
Dr. Strangelove
Lawrence of Arabia
Das Boot
Apocalypse Now
Patton

Comedies
Dr. Strangelove
Duck Soup
Sullivan's Travels
His Girl Friday
Shaun of the Dead

Horror/Thriller
Shaun of the Dead
Dawn of the Dead (original)
Invasion of the Body Snatchers ('56 version)
Evil Dead 2

Noir Flicks
The Third Man
Double Indemnity
The Night of the Hunter
M

It goes without saying that all of these lists are incomplete, and I could keep going ... but I'll spare you. I like way too many kinds of films.