For ones I haven't seen yet:

Dune (1984)
2001: A Space Oddesy
2010: The Year We Make Contact
Titan AE
Imortal
Serenity
THX-1138
Metropolis
Blade Runner

For ones I have seen
Star Wars IV-VI (Original theatrical set, 1997 redits, and mid eighties reprints)
Star Wars I-III
Planet of The Apes 1-5 (Not the Tim Burton one)
The Matrix 1-3
Independance Day

And for TV series:
A bunch of old Buck Rogers episodes
Some Outer Limits VHS
Lost in Space (Some signed by a Mr. Mark Goddard)

That is my 'Outter Space' sci fi collection.

Which of the first set should I watch tomorow? It will be raining, if that influences your opinion.