I've taken to watching Poirot and Endeavour...
Recently re-watched Event Horizon which I last saw in the theater when it first came out-
For your sci-fi kick you might try these films- I consider them B grade but fun to watch-I've been on a bit of a sci-fi kick lately, but unfortunately I can't really recommend too much of what I've seen. I did watch THX1138 thanks to @ectoflanger. That was pretty good, but you've probably already seen it. Another Earth was OK, but it was a little thin on the "sci". Almost more new-agey.
Last week finished Endeavour... It might have finished for good.
So I've been back in sci-fi mode, and I've been watching a series of movies I had originally avoided thinking they would be too juvenile. I speak of The Hunger Games. I've now seen the first three, and I've got the fourth one here. I have to say: I'm hooked. First of all, the cast is a dream: Woody Harrelson, Elizabeth Banks, Stanley Tucci, Donald Sutherland, Philip Seymour Hoffman, Julianne Moore, plus the talented young Jennifer Lawrence in the protagonist's role, just to name a few. Even Lenny Kravitz turns out to be an excellent actor. It also happens to be a great story, full of moral ambiguities and a real human heart.
I love these types of stories: rebellion against a dystopian future state. Everything from Star Wars to V for Vendetta to The Matrix fits this mold. My GF just recommended I check out the Divergent franchise. Any other recommendations along these lines?