Just thought I'd return to this thread.
I've seen a lot more films than when I started this thread, and it's nearly impossible to make a top 10. There are just so many good films.
Out of the films I've seen, here are all the films that I give my highest rating (10/10) ...
Rosemary's Baby
The Exorcist
One Flew Over The Cuckoo's Nest
Jaws
Rocky
Alien
The Shining
The Elephant Man
The Empire Strikes Back
The Thing (1982)
The Fly (1986)
Aliens
The Silence of the Lambs
Pulp Fiction
^^^ There are in no real order, save for the year of theatrical release. And they're great films, masterpieces, IMO.
Of course, there are many critically-acclaimed films that I haven't seen - The Godfather, The Godfather Part 2, E.T., Schindler's List, Dawn of the Dead, etc. ...