My favorite early Kieslowski (pre-Decalogue) would be Blind Chance. I just love the whole concept of it, and I'm one of those people who can lie awake nights for hours wondering how much would be different with one little detail. That film brilliantly shows how one man's life would be radically different from an event that wouldn't seem to have much weight. I have not yet seen the Calm Before the Storm, so perhaps I'll get a new favorite someday. I would like to get a closer look at some of his films, there's so much in all of them, that I really think I'm missing something with just one viewing.