I've only seen a couple of classics, but my top 250 would consist of:
Network
One Flew Over the Cuckoo's Nest
Pulp Fiction
A Clockwork Orange
A Streetcar Named Desire
All ABout Eve
Pan's Labyrinth
Psycho
North by Northwest
Schindler's List
Unforgiven
Fargo
Raiders of the Lost Ark
City of God
The Social Network
The Silence of the Lambs
Inglourious Basterds
Bringing up Baby
The Wizard of Oz
West Side Story
On the Waterfront
Stalag 17
Stagecoach
Magnolia
Halloween
Scream
Carrie
Citizen Kane
Taxi Driver
Goodfellas
Titanic
As Good as It Gets
Babe
The Good, the Bad and the Ugly
Back to the Future
Amadeus
Chinatown
The Godfather: Part I
The Godfather: Part II
The Apartment
It Happened One Night
The Conversation
Double Indemnity
Midnight Cowboy
...............................and lots more others.