How about some of the finer aged stuff? I take it you've then seen:

Invaders From Mars(original)
Journey to the Seventh Planet
The Day the Earth Stood Still
20 Million Miles To Earth
Earth Vs. the Flying Saucers
The Thing(Hawks)
Fahrenheit 451
Kronos-Raveger of Planets
When Worlds Collide
Forbidden Planet
This Island Earth
The Crawling Eye

...and I'm sure you have seen THX 1138.

These are just a few faves. I have many, many more in the library and you can find them by checking out my Sci-Fi/Fantasy folder.

While you are at it....you'll also see I own films like Soylent Green, Omega Man, Silent Running, Planet of the Vampires, One Million Years B.C., Logan's Run, Starcrash.......and tons more. Hopefully they will release Crack In the World before long.

Haha, yeah... I guess Equilibrium was pretty cheesy too... I usually look for weird twists and original ideas in Sci-Fi, Serenity just seemed underdeveloped. Not to mention the acting was way over-the-top most of the time.

Thanks folks, great stuff... Serenity seemed underdeveloped because the characters and such had already been developed in Firefly... And Gutwrencher, great movies, ive seen most of them but ill have to check out Kronos-Raveger of Planets amd When Worlds Collide.

My vote goes to Colossus: The Forbin Project, although it is only available in atrocious pan-and-scan on DVD.

Since some of my favorite Sci-Fi choices (City of Lost Children, Delicatessen, Avalon, Strange Days) have been picked, I have little to go by (but are all excellent choices just the same). But here's a few ..

Returner (Japanese time traveling thriller)
Le Dernier Combat (French post apocalyptic yarn with almost no dialogue by Luc Besson)
Avalon (I couldn't resist mentioning this one again. I love Oshii's works) I'd even go as far to say see his anime titles Ghost in the Shell and Innocence. Either of these titles can supplant many recent (within last 20 years) Hollywood attempts at Sci Fi.
Stepford Wives (Not exactly what you think ...)

La Jette. It's where 12 Monkey's and the Jacket came from

Check out the animated Sci-Fi films of René Laloux: The Fantastic Planet and Light Years.

Donnie Darko and Serenity are two recent favs of mine and I'll add the series for Firefly

I watched Immortal, which I got fromtoddly6666 list a few days ago. Very different and one of those that I didnt exactly know what was going on but still pretty solid.

If you do lean toward some older ones, don't miss "The Day the Earth Caught Fire."

the day the earth stood still.... its a classic

For a more European artsy sci-fi check out:

Stalker
Alphaville

Piper said he ad-libbed this on the set. I remember seeing the same line in one of those old NFL films movies they'd show on ESPN. I always wondered who said it first, Piper or some NFL guy.

Alphaville (Godard, 1965)
Element of Crime (von Trier, 1984)
La Jetee (Marker, 1962)
Je T'aime, Je T'aime (Resnais, 1968)
Galaxy Express 999 (Rintaro, 1979)
Demonlover (Assayas, 2002)
World on a Wire (Fassbinder, 1973)
Until the End of the World (Wenders, 1991)

Wow, my Netflix queue has jumped up by at least 30 movies thanks to this thread. The ones I would have listed already were.

Thanks for the suggestions!

Check out the Korean anime "Wonderful Days" (I think it goes by Blue Sky for the US release). It got mixed reviews, but I really enjoyed it (and I'm not the biggest fan of anime). Good soundtrack too!

Enemy Mine is one of those early 80s films that tend to get lost when people talk about sci-fi. Enjoyable movie.

Cherry 2000 Now this is not that great of a movie, but I couldn't stop watching it. Give it a shot, it might be your kind of thing. It's a cult thing like Repo Man, with some similarities to Buckaroo Banzai and Mad Max.

Good luck finding that movie, only available in Germany and Italy as far as I know but English speech. It's a bit long at 280 minutes.
"Until The End of the World (aka Bis ans Ende der Welt)"

A bit too "arty" for me.

Is Light Years on DVD yet?

I remember seeing it a long time ago, and it is a thought-provoking sci-fi film.

Unfortunately, no. I rented it a few years ago on VHS, and ever since then I've hoped that it would get a DVD release, but it hasn't yet.

Seconds

if you're a fan of the japanese films sony/tristar seems to releasing just about everthing from the godzilla era of the 60's although most of these movies are kid friendly and low buget

Mostly just some seconds:

Repo Man
ExistenZ
Videodrome
The Fly (Cronenberg)
The Hunger
The Hills Have Eyes
Knightriders

And just about any John Carpenter film, including:
The Thing
Escape From New York
Big Trouble in Little China
Prince of Darkness
In the Mouth of Madness
Ghosts of Mars

Silent Running - Not really a FX driven movie, though the FX is fantastic, it is "slow paced" story driven movie. This was one of the first movies I saw as a kid in the theaters that had an emotional effect on me. The movie could be listed as a "Save the Environment" type film.

Director Trumbull is a bit of a special effects legend in the business. If you have been impressed by the effects in a movie then the chances are good that Trumbull had a hand in the affair. He did the effects for, amongst others, 2001, Blade Runner and some of the Star Wars movies. Yes, the effects in Silent Running are good but they don't overwhelm the pic.

NM.

Try Fox's short lived "Harsh Realm" series. Which can be found on DVD cheap.

I'll second "The Day the Earth Stood Still"
also try "This Island Earth" both are classic sci-fi