Mine depends on the genre. I like:
Gone in 60 seconds (car movies/thieving)
Tombstone (westerns)
Boondock Saints (shoot'em up action)
Spiderman 1,2 (hero movies)
Punisher (shoot everybody action)
Lord of the Rings (epics)
Star Wars 4,5,6 and then 2,3 (sci-fi epic)
Sweet Home Alabama (the one and only chick-flick/comedy that I can tolerate)
Legend of Drunken Master (Kung Fu)
Fist of Legend -Jet Li version (another Kung Fu that I love)