I need to see Nostalghia. Good list. I liked Ivan's Childhood a lot too, and you have a great top three.
I think, you could have placed Solaris higher. It's a really thought provoking film, although it falls a bit into science fiction genre, something that Tarkovsky called an artistic failure and tried to make Stalker genre-less. As a personal opinion, I don't put The Sacrifice as number one. The Mirror is a better film, Solaris is a better one, and of course, Stalker is definitely better (definitely in my opinion).
What's you number one favorite?
