I certainly echo some of the above recommendations by Newb and Rod here are some that have not been mentioned that I like ...
Korean-
The Vengeance Trilogy (All great films although personally I think Oldboy is the best)
Black House
H
Memories of Murder
Tell Me Something
Japanese-
Ju-On The Grudge 2 (Less slow moving than the first;) )
Death Note/Death Note 2
One Missed Call
Suicide Club
Lady Snowblood
Ichi the Killer
Chinese
The Eye 2(Seems to be a love it or hate it film,I love it:) )
Re-Cycle(Another Pang Bros movie and their best imo,a must see)
Thai
Shutter(If you like movies that make you jump then you will love this )
That's the best I can think of but I've probably missed a few great ones that I will think of later ...:)
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