Just about anything by Kiyoshi Kurosawa. It all might be an acquired taste, but I haven't seen a single thing by him that I didn't like. Some of it is a bit artistic (like Bright Future or Tokyo Sonata), while others are just great, low-key thrillers or horror flicks (Cure, Pulse/Kairo, Retribution), but all of them share a similar... almost quiet kind of style. I once saw a quote calling his movies hypnotizing; I'd certainly say that's the case for me.
My favorite of his is Bright Future, but it's also a movie that I'd fully understand if someone just didn't like it. For some reason it always manages to tug at the heartstrings for me, yet I can't fully explain why.
[youtube]http://www.youtube.com/watch?v=9mcnvp1yKJo[/youtube]