Any good J-Pop bands of artists for beginners?

I've been a diehard anime fan for a long time now so I sort of gained interest in Japanese muziek too. Really, I've only been listening to Kyary Pamyu Pamyu and VOCALOID, and I'd really like to try branching out my interests, so any suggestions? I'm a pretty big fan of muziek with a beat, techno music, dubstep music, basically anything that gets u pumped, but I'd be willing to try other things!