It depends how heavy you're willing to go? I'm more into J-Rock/Metal than I am J-Pop (with the exclusion of Vocaloid, of course).
My favourite artists are:
MIYAVI! :|~
X-Japan
Dir En Grey
The Gazette
L'Arc-en-Ciel
Alice Nine
Versailles
Nobodyknows
Uverworld
Kagrra
My main love is J-NRG, Japanoise and Bitpop:
Yoji Biomehanika
Remo-Con
Guld
Nish
Not particularly fond of J-Happy Hardcore. Haven't been able to get into it.
