Tool is a great fucking band.
Check out some later material by Coheed and Cambria. Listen to the song "Domino the Destitute" and if that piques your interest go from there.
http://www.youtube.com/watch?v=R0ogODyzUNM
Also Gravity's Union. Epic track.
http://www.youtube.com/watch?v=z_nTTZs7Dhk