Im gonna second whoever said Oceansize. Theyer amazing. I particularly appreciate their use of bizzare time signatures like 11/8 and 13/8 and how they can make the song flow perfectly to them. Theyer latest album "Frames" is especially good. Also, +1 to The Mars Volta, Porcupine Tree, Frost*, and Dream Theater. Volta kinda has this "Holy sh**t my brains are on fire" element going for them, which i really like. As for DT, ive never been too keen on the operatic vocals + metal/prog scene, so i listen to them sparingly, but they certainly have technicality and intruiging musicality in spades. I saw them live not to long ago in Maryweather with Queensryche (sp?), Scale the Summit (also very awesome), and Zappa Plays Zappa, who tbh were my fav perfomrance of the evening. They totally blew me away. Other bands who are kinda-sorta proggy but amazing nonetheless are: Pure Reason Revolution (In Aurelia!), Blackfield, Karnivool (especially songs like Umbra, Deadman, and Change, but my faves of thiers also include All I Know, Set Fire to the Hive, Themata, and Goliath), Liquid Tension Experiment, Pendulum (Theyer prog to me because theyer the only techno/electronic/rock band who sounds anything like them to my knowledge.), and A Perfect Circle (they have members from Tool, if im not mistaken). You'll find most of these guys to be prog-rock, as im not a big fan of classic, older prog (ala King Crimson and the like), excluding Rush, of course , so you'll have to forgive me if my definition of prog is a little stretched.