Pretty much anything that Brian Cook has played on - These Arms Are Snakes (in particular the new album, 'Tail Swallower and Dove'), the latest Russian Circles album 'Station', 'We Are the Romans' by Botch and 'Time & Withering' by Mouth of the Architect are all brilliant. Jeff Caxide from Isis is another great bass player as well, as is Troy Sanders of Mastodon, I'd recommend anything by either of those two bands. Also, +1 for The Mars Volta, 'Day of the Baphomets' is probably their standout track bass-wise.