well, im not sure if this is what you're looking for, but here are some examples of good avante-garde metal bands:

celtic frost
meshuggah
abigor
The Dillinger Escape Plan

__________________
"Once you're into it, you're into it for a lifetime."
(dimebag darrell abbott 1966-2004)

no truer words have ever been said.
in summation: metal=life
RIP dime