best rock metal band's ?

I like many metal bands...from System of a Down and Korn to Dimmu Borgir and Emperor, depending on my mood. I generally like fast metal songs.

Then you probably wouldn't like Sunn O)))), they're not very fast, but very metal. I haven't heard their collaboration with Boris yet, but I hear it's great.
Maybe you'd like Boris, they're faster than Sunn......