Dir en grey is my top, and then (in no special order) Dual Jewel, Miyavi, PIERROT, Gackt, Malice Mizer (in the Gackt days), Psycho le Cemu, Nobody knows+, Orange Range, Ayumi Hamasaki, Utada Hikaru, Sowelu, and Rhymester. (i know, i'm such a nerd...
) i know, half of those aren't even J-Rock, but what the hey, i like 'em anywho.