No particular order:

Hero - Love chinese martial arts movies and the story of this one is great too, almost has a fairy tale feel on it.

Crouching tiger hidden dragon - Again Chinese martial arts movie, great stuff.

lotr trillogy - Great story and amazing battles.

Star Wars episode 4,5,6 - Those are just classic, best science fiction ever.

Scarface - Best gangster movie.

Matrix - The original is IMO the best of the 3, didnt have the ''wow!'' feeling as much with the second and third than with the original matrix.

Pulp Fiction - This is the best Tarantino film IMO, hard and hilarious.

Predator 1&2 - 1 was better but I list them both because the predator just fucking owns all, cant wait for Alien vs Predator to come out.