LOTR is also listed as fantasy. But I think action is a kind of superset ( regardless of the other genre).
I also look at Alien as Horror ( but then I'm gonna put BladeII on my list so go figure)
But I agree with J31
Specifically:
300
Blade II
then I go t to add
Terminator II
MI 2
Matrix ( Part 2 didn't do it for me till they got on the freeway, part 3 .....

)
SpiderMan 2
Blade Runner ( could be considered sci-fi)
Saving Private Ryan (somebody else mentioned it but its worth a repeat)
Ronin
Bourne Identity ( I'm picky about my hand to hand combat scenes, and in Supremacy.... they did too many cut away shots for my personal liking. But in part I, he handled business like he was supposed to).
I would really like to see somebody do a serious treatment of any of the Remo Williams books. That movie that they did back in the day was horrible, but dude ( in the books ) was really of the chain . So was Chuin.
I would also like to see a serious treatment of the Splinter Cell RPG's on the big screen.
Jlewis