The Most Technical Band

What about math metal bands I hear about which often revolve around one chord or note used in complex time signatures that are off beat with the drums and bass?

yea, I guess you have a point there. I was originally thinking of albums like Det som engang var that are very deep/complex in composition but very amateurish in technique.
 
I guess I would put Dream theater at the top, but I listen to all of their work and have for so long that I have been numbed to how technical they are to a new listener. Behemoth is technically brutal when they try to be, as well as Nile and Spiral Architect.
 
God damn, just watched Silence Calls the Storm again and realized how god damn good Quo Vadis' drummer is.

Anyway, uh, Necrophagist and probably Symphony X.