A few of my favourite films:
One Flew Over The Cuckoos Nest
The Shining
Onibaba
Shawshank Redemption
Hamburger Hill
Zulu
The Longest Day
Jaws
Enter The Dragon
The Exorcist
As mentioned in earlier posts,its hard to pick a definitive top ten,because you can always look back and wish you added A,B,or C to your list.