Suggestions for good clubs in Tokyo

I'm going to Tokyo for a few days in May, and I'd definitely like to experience the nightlife while I'm there. So, does anyone have any suggestions for decent nightclubs in Tokyo? I'm looking for:

*Good music (preferably J-Pop, J-Rock such as Matsushita Yuya, Gazette, Gackt, Kalafina, SID etc)
*Not too high cover charge/entrance fee
*Reasonably priced drinks
*Good atmosphere
*Popular but not too crowded - somewhere with room to still dance would be nice

I was thinking about checking out Muse, but I've heard varying reviews about it. Some people seem to think it's brilliant, some people think it's awful and overpriced. Plus it seems to get massively crowded. So any comments on that or any other suggestions gratefully received.

I dont really Know about what you are looking for, but all I can say is don't go to Gaspanic club in Roppongi. Muse is much better. Not sure you'll find a club with jrock music. It's more about general club music ...

if ur into more of the alternative and underground u shld peep this womans blog

very extensive knowledge of that kind of culture, places to go