Are you just looking for asian horror? That's how it seems, in that case check out....
Dark Water - (the thing is just freaky,check it out)
Audition - (quite possibly the most unrelenting and shocking last 20 minutes ever)
Phone - (the kid in the film is terrifying enough as it is...great movie!)
And as far as some great American horror titles you might not have seen yet
May - (telling you the plot would ruin half the shock factor, just know it turns horrific)
Session 9 - (imagine a Silent Hill type plot but inside of an abandoned Asylum)
In the Mouth of Madness - (just watch it. deep, creepy and disturbing)