Sci-Fi phase... Help with titles!

[ulthar]

ASTRO ZOMBIES (1968) (but don't blame me if your head hurts after you watch it...you asked)

TEENAGERS FROM OUTER SPACE (1959)

MISSILE TO THE MOON (1958)

edit to add:  THE PHANTOM PLANET (1961)

[Allhallowsday]

Dear everyone,
a friend of mine and me often see movies together as we share the fine taste of b-movies. Now we are seeing Godzilla and other monster movies.
But soon we want to pass to Sci-Fi, while I am quite the connoisseur (eheh) of giant monster movies, I am not really in Sci-Fi so I would like to ask for help.
At the moment we have this on list:
Galaxina [1980],
Forbidden Planet [1956],
Space Mutiny [1988],
Star Wars [1977] (thanks to Harmy's Star Wars Despecialized Edition)...
As Forbidden Planet [1956] shows the movies do not need to be bad. Nonetheless we don't mind, as reader of this website you know what I mean :)
So? What do you suggest from Sci-Fi old timers?

etmoviesb,
You have gotten a lot of suggestions.  Good movies, Bad movies, essentials, etc.  Though I LOVE 2001: A SPACE ODYSSEY, for example, I would not recommend it.  The first time I watched it, I found it long, tedious, and boring.  I have since come to LOVE that one and other films I would describe as "motionless", I guess... "tedious".  Other favorites have been suggested that are in my opinion tried and true diehards that are not for novices, obscure, or just plain lame. 


However, for great SCIFI try:

THE THING From Another World (1951)  The great 1980s remake was suggested to you, but without the superior original there'd be no great remake and that remake is more Horror anyway.  If you are interested in classic SCIENCE FICTION films, start with the first post-war great SciFi film.   

THE WAR OF THE WORLDS (1953) which is in color and has a wonderful look and effects.  This one makes a strong impression particularly on young people. 

INVASION OF THE BODY SNATCHERS (1956)  This one also has a wonderful remake, but it started with this superior film. 

Three is enough to start with, no?