Our choice was Moon, showing at the Irish Film Institute. We'd heard a review on the radio, and it sounded like our kind of movie, science fiction, but not Hollywood. If you liked Solaris (I must get the book for that actually - it sounds very interesting), you'll like this too - more atmosphere than special effects, and a very good story, following Sam Bell, a technician on a 3-year contract with a Lunar mining station. Sam Rockwell, the actor who plays Sam Bell, is excellent throughout.
I won't say much more than this, as I don't want to spoil it (don't read the synopsis or the "about" section on the website - it tells you too much about what's going on). It's one of these movies that we'll probably own on DVD, perfect for watching again on a rainy day.