I watched an interesting horror B-movie recently - Black Mountain Side.
You could tell it was going for a The Thing feel, and it sort of pulled it off. I liked how it was set in Canada, and liked how I was able to put my Anthropology degree to work in understanding what the cast was talking about! :-)
The "monster" was...odd. Yet it got creepier the more it came up - the fact of whether you don't know if it is real or in their heads makes it even more creepy.
Give it a watch if you like atmospheric horror movies like The Thing, you might just enjoy it.