moon is awesome. watch it if you haven't already, although it's not much of an action movie.
uhm, serenity is ok, i know some people who think its da bomb,
district 9, but i'm guessing you've seen that already.
the fourth kind, for a kind of alien themed blair witch project. It gave my mate the willies for about 2 months, he's still scared of owls
tbh, i can't see what everyone likes so much about star wars, its ok, but not great.