I love Dream Theater, ever since I heard them in 1993. I've also gotten into Symphony X and Orphaned Land over the past few years. I like a lot of different kinds of music but progressive metal is definitely a favorite.
Love progressive branches of many genres especially progressive rock of the 1970s. Love Pink Floyd, Yes, early Genesis, Emerson, Lake and Palmer, King Crimson etc.
As for prog metal...well I love Dream Theater, Procupine Tree (saw these two recently in Sydney)Meshuggah, Between the Buried and Me, Dillinger Escape Plan (i consider Mathcore to be a form of prog metal)and Coheed and Cambria (perhaps not purely metal but i have included them anyway!
yes , I am very fond of progressive metal
Opeth ; Dream theater and Riverside are some of my favorites
:D in addition of some other great bands ..
my favorite song for Opeth would be "Masters apprentices"
Dream theater : "Dance of eternity"
and Riverside : "Lef out"