I don't think there has been a movie mentioned in this thread yet that I haven't enjoyed.
(Yes Big Dave, I loved Flesh Gordon
)
Picking a favorite is pretty difficult, so I'll mention one that I don't think has got a gurnsey yet - 12 Monkeys.
Oops! Gotta mention Dark City as well.
Oh, and the recent Solaris re-make with George Clooney.
Yep, it's hard to pick one favorite.