I'm a bit late on the bandwagon here as this band have been around a while, but at least I got to hear some of their music at last. Porcupine Tree in some ways remind me of a hyrid between the Doors and Floyd. They have the guitars and big sound of Floyd with the angsty lyrics of Jim Morrison. Its definately a band for the rockers amongst you. If you like Zepplin, Floyd, Sabbath or Doors then I think this will definately be something you should run out and listen too right away !
http://www.pauseandplay.com/porcupinetree.htm
http://www.pauseandplay.com/porcupinetree.htm