Premonition (The original Japanese not the American crap):
Suicide Club is a great social commentary on Japanese culture. I have to say it is my favorite on this list. Plus Dir en Grey is in it.
Ju on the Grudge. If you have seen "The Grudge" staring Sarah Michelle Gellar well, that is a very cheap knock off. I am a hard scare, and this one made me shiver in my pansy red booties.
Audition: I quite literally screamed at certain parts of this movie. My husband and I had to hide our eyes in each others chests a couple times just to get through it.That to me gives it a big star.
Dumplings: The whole premise behind this movie is so messed up that it has to be included.
Moon child: Not really horror, but when ever I make a movie list it has to be included. It has Hyde...and Gackt enough said. http://www.imdb.com/title/tt0365376/
I know I have more but those are my favorites! I am pretty sure if I asked my husband he would argue with me, but this is MY list.