certainly audition and ichi the killer. he has done other good films like the dead or alive series, but they fall more into the gangster/yakuza genre.

Audition was ok, but Visitor Q is much better. Thats a keeper.
Evil dead Trap is also pretty good and not to forget the Guinea Pig movies.
Ohh yeah The Whole is great too, and then ofcause there is the Ringu trilogy.

Ah, the legendary Guinea pig movies... impossible to get on your hands, at least in Finland. the only thing I've found is a very short trailer. do you have any idea where one could get those gore classics?

Yeah I know, they are not easy to come by here in Denmark too, but other than share networks, then the DVDs can be bought some places on the net.
I know that most of them (if not all) can be bought on www.half.ebay.com

http://www.unearthedfilms.com/

i picked them up at a film show in birmingham.

evil death trap 1&2 and not forgetting the men behind the sun trilogy.

Well MBTS are Hong Kong movies, they just picture the killing of 300000 chinese killed by the Japanese army, but they are all made in Hong Kong, hehe ( I know that one was bad). And there is 4 of them :)
They are ok, just not as great as a war film can be, but pretty good none the less. Evil Dead trap are cool :P

how about some japanese zombie films, junk, wild zero and versus.

Try Dark Water, Ichi The Killer (techinally not horror), Vistor Q, and Evil Dead Trap

the Korean film 'a tale of two sisters' is really good, its not really horror but more of a suspense film with horror elements.