I watched "Battle Beyond the Stars" like a zillion times as a kid, so it still has a spot on my list in the "cheesy nostalgic" category (along with the original Battlestar Galactica series).
Others in that category would also include "Logan's Run", "Buck Rodgers", and of course the wonderfully scored by Queen classic, "Flash Gordon".
In the more serious categories, though, I'd have to go with "Tron: Legacy", "Serenity", and "Titan: AE" as three of the top of my head. So many good ones to choose from it's hard to say.
I was trying to remember Logan's run! It was the first movie to use Holographic projection!