It's difficult to suggest if I don't know the extent of your movie viewing. I'll give it a try:
Megaforce
Krull (1983)
Arena (1989)
Eliminators (1986)
Star Crystal (1986)
Flesh+Blood (1985)
Split Second (1992)
Hearts and Armour (1983)
Big Trouble in Little China
Robinson Crusoe on Mars
The Man Who Would Be King
Jason and the Argonauts (1963)
Remo Williams: The Adventure Begins
Something Is Out There (TV miniseries)
Sky Captain and the World of Tomorrow
Metalstorm: The Destruction of Jared-Syn ~ originally 3D
Spacehunter: Adventures in the Forbidden Zone ~ originally 3D
I can't guarantee that they're "awesome", but I've always enjoyed them. They are a mixture of science fiction, action and fantasy.
EDIT: I agree about "Retroactive"! It's a great time-travel movie.