Be warned though, they're the absolute opposite of Dev's SYL; it's quite chilled out and proggy. Best album to look into is Synchestra, so give that a blasting.
Pantera - Suicide Note Pt.1/Suicide Note Pt.2
Possibly the best lyrically written of the whole Pantera catalogue; from depression and pain in Part 1, to obliterating angst in Part 2. Awesome.