My favorite action movie from the 80s would probaby be Predator. There were so many great 80s movies, especially comedies, that it's hard to pick a favorite.
The Breakfast Club
Back to the Future
Say Anything (although it is quite annoying that they overused the "radio scene" today..)
Adventures in Babysitting
Ferris Bueller's Day Off
Working Girl
Dirty Dancing
Beat Street
The Last Dragon
Beverly Hills Cop 1 and 2
Bloodsport
The Naked Gun
Overboard
Private Benjamin
Raiders of the Lost Ark
Die Hard
Jumping Jack Flash
Moonwalker
Nat'l Lampoon's Vacation
Police Academy
Rambo: First Blood
BladeRunner
Rock (all)
Robocop
Short Circuit
See No Evil, Hear No Evil
Space Balls
Superman (all)
Teen Wolf
The Terminator
Ghost busters 1 and 2
The golden child
Coming to America
Top Gun
Twins
Troop Beverly Hills
Karate Kid 1 and 2
The Last Dragon
Mad Max beyond thunder dome
Lethal Weapon
The Untouchables (Andy Garcia ~cheesey_grin~ )
Three O Clock High
Weekend at Bernies
Dirty Rotten Scoundrels
Death Wish: (all)
E.T.