@UnConcious: Of course I know Mezarkabul, they are well known in Greece too. I have "Unspoken" and "Anatolia" albums which are really very good , but I prefer "Unspoken" because it combines better folk turkish music with metal (Anatolia is more folk). Both are very good albums, for sure.
I finally noticed another turkish band called Almora. I have not listened to anything from them yet, but from descriptions I learnt that they play symphonic metal or something and they sing in turkish language.
As for japanese metal, the best band there is Loudness. They started at the early 80s and have released several albums. I have Disillusion, one of the best metal albums that was released in 1984.
edit: Does anyone of the Turkish mates know a mailorder where I can find Bir album?