My faves are, listed alphabetically by composer's name:
John Barry:
The James Bond Theme
Elmer Bernstein:
The Magnificent Seven
Leonard Bernstein:
On the Town
On the Waterfront
West Side Story
Bill Conti:
Rocky
Don Davis:
The Matrix Trilogy
Danny Elfman:
Batman
Edward Scissorhands
Spider-man
Michael Giachhino:
The Incredibles
Jerry Goldsmith:
Patton
Star Trek the Motion Picture
Chinatown
L.A. Confidential
Bernard Herrmann:
Vertigo
North by Northwest
Taxi Driver
Henry Mancini:
Touch of Evil
The Pink Panther
Clint Mansell:
Reqiuem for a Dream
Ennio Morricone:
The Good, The Bad, and The Ugly
The Mission
The Untouchables
Cinema Paradiso
Thomas Newman:
American Beauty
Angels in America
Michael Nyman:
The Piano
Nino Rota:
Romeo and Juliet
The Godfather
Howard Shore:
The Lord of the Rings
Max Steiner:
Gone With the Wind
Casablanca
John Williams:
Close Encounters of the Third Kind
the Star Wars saga
Superman
E.T.
Schindler's List
Saving Private Ryan
Vangelis:
Blade Runner
Hans Zimmer:
The Lion King
Gladiator