a lot of the stuff I was going to contribute has been mentioned already, so here's a few more...
Obliveon
Division By Zero
Ark (kinda power-y but rather good...especially "Burn The Sun")
Cephalic Carnage
Scarve
Quo Vadis
Psychotic Waltz
Sadus
Starkweather (though in a wierd way...not so much flashy technical, but thought out still)
Cacophony (yes, with Jason Becker/Marty Friedman)
Extol
Vampire Mooose
Unexpect
Textures
Gnostic
Zero Hour
Illogicist
Emperor (Prometheus is a pretty technical album, as is IX Equilibrium)
Morbid Angel (Domination forward has a lot of technical aspect to it)
Exivious
I dunno...just a couple I could think of...