Here are mye favourites.. ;)
Dream Theater (I'm a proud member of the Official Norwegian Dream Theater Fanclub)
Arena
Pagan's Mind
Circus Maximus
Spock's Beard
Neal Morse
Pain of Salvation
Ayreon
The Beatles
Symphony X
Toto
Jordan Rudess
Kino
Andromeda
Adagio
K2
Glass Hammer
Derek Sherinian
... and many more.
Do you think that is too much prog? ::)