K.
There's one band in particular I know you'd like, it's a supergroup with members from Opeth, Dream Theater, and some prog rock bands... points from King Crimson though, favorite prog band. cbf to check your last.fm right now, but if you haven't already, check out Spock's Beard and Porcupine Tree. If I'm remembering them right, they're both kind of that "hard edged" prog, like King Crimson. Genesis is a classic too, they're kind of boring for the most part but The Lamb Lies Down on Broadway is a fantastic album.