I bought "The Magnificent Seven" on DVD tother day for like $15.... arguably this is the genesis of ALL modern day action movies.
Pulp Fiction.
Forbidden Planet
Like I said Star Trek 2, 4, 6 and First Contact.
Taxi Driver
Dog Day Afternoon
Apocalypse Now Redux (the extra footage makes it make sense, plus theres boobies...)
Heat
Silent Running
Soylent Green (when Amazon fiiiinally ship them grrrrr)
Easy Rider (only for the scenery and Jack Nicholson)
Vanishing Point (the original not the lame-ass remake)
Rashomon (Kurosawa's masterwork)
Ran
The Seven Samurai (if you have the Magnificent Seven, you must have this)
The Big Sleep
Double Indemnity
Rio Bravo
Vertigo
Star Wars (none of this Episode 4 shit, the first star wars IS star wars.....)
Rear Window
Leon/The Professional
The Rock (about my favourite action movie)
Team America World Police.. just saw this yesterday having deferred thinking it would be overhyped and not funny. In fact the funniest movie I have seen in ages.
there are others but thats off the top of my head.
Bro Town ow
Clerks
The Crimson Rivers (the first one, with Vincent Cassel in it)
Ghost in the Shell Invader Zim
Not Another Teen Movie
Ronin
Super Troopers
Tongan Ninja