I personally didn't like Scanner Darkly. If you have read anything by Samuel Beckett and/or Paul Auster, or seen Fear and Loathing in Las Vegas, you won't be impressed by Scanner Darkly. Good Scifi is hard to find though. Lately I've devoted my time into rewatching the older classic. Space Odyssey, Solaris, Close encounters...etc... Those movies are still unmatched today and don't even get me started on Sunshine. That movie was incredibly clumsy.

Since you didn't mention Anime, you might wanna check out Ghost in The Shell. The series and the first movie were quite good sci-fi. The series more so than the movies.

As for Horror/mystery: Silent Hill. It's based on a game so it's easy to overlook, but I felt that it was a very well written movie regardless. I didn't go see it in a theatre because I thought it was just going to milk the game, but when I saw it on DVD, I was impressed with the quality of writing. It's more like a mystery than a horror film, but it works well.

-Morbo will now introduce the candidates - Puny Human Number One, Puny Human Number Two, and Morbo's good friend Richard Nixon.
-Life can be hilariously cruel