one of the more interesting films i;'ve seen recently is requiem for a dream, probably the most disturbing film i've ever watched. it's the only film that's ever made me feel physically unwell and whilst i find some of it difficult to watch because the direction feels to pretentious and arty for the sake of being abstract, the story is compelling and the cast is superb. i'd recommend it.
On your recommendation, i've purchased it on play, along with Amelie (not seen), Downfall (not seen) and Shawshank (seen, adding to collection).