Any good language schools in Japan?

I'm going to be traveling to Japan, for a year, on a Japanese language school, but there are many schools to choose from, and I wanted to know if anyone have any tips on any good schools.

I want to study for a year, rather not a big class, but with students that are serious on studying Japanese, and in Tokyo (but schools suggested outside Tokyo is fine too).
I alredy have looked at the website "Go Go Nihon!", but I still are unsure, and I like to plan and rescearh well, before going.

Thanks in advantage.


Ps. I'm not traveling before 3 years as I'm going to finish my education first.