DAMN, Rayne. That's pretty damn comprehensive. :p
I wonder if it was
Kaidan that your son got bored with - I've tried to watch it myself, but couldn't get into it, though I've heard that in some circles it's considered a "classic." I see that you're still looking for that one, though...
Onibaba is also another "classic," though I haven't seen it myself.
Not your typical Asian ghost movie, but
The Red Shoes definitely packs some punch. Not perfect, but has some great, creepy moments.