I've gotta say, old school guys like Hironobu Kageyama are fantastic as well to the list of groups/artists like Miyavi, L'arc, Kung Fu Generation, Orange Range, Utada Hikaru, Nightmare, and don't forget UVERworld.
What's always funny is I've got a playlist which happened, by chance, to be theme music to a bunch of Shonen Jump animes.
Keep your eyes on me, now we're on the edge of hell.