I'm a big Vampire Knight fan, so yes, I have to agree with this. But they really have to pull it off well and because I'm biased towards J-dramas, I would definitely prefer it to have a Japanese cast.
My choice would be Kamenashi Kazuya as Kuran Kaname. I'm still unsure as to who would make a good Zero coz not many actors are able to sport the silver hair. But Sato Takeru would make a nice Senri Shiki though. :D
EDIT: Okay, so I didn't read the main forum thread and I apologise for being such an idiot. *facepalm* Sorry, but I don't know any Korean actors to fit the bill. >.<