Labyrinth
Rhapsody
Vision Divine
Symphony X
Tony MacAlpine
Cacophony(Mart&Jason)
Racer X(Gilbert)
Joe Stump
Vinnie Moore
etc..(alot of neo/prog and some power metal)

i think i've heard some arps in technical deathmetal like;
Children of Bodom
In Flames
and black;
Mayhem
Covenant
Dimmu Borgir
Borknagar..

not sure though..