Ice Pirates is great, followed by Starcrash. Deep Red would also be top three except it takes place on earth.
Starcrash??!!
Okay, now you're just playing with my mind.
That was ... something ... I wouldn't put it on anyone's "best" list. I recall it was a spaghetti western in space or something like that.
Might as well add the Space version of the Magnificent Seven with John Boy and the Man from UNCLE (if only in the Humor category).