DFD, I got some more for you. Most of these aren't quite as obscure as my previous recommendations.

Shadows Fall - "Of One Blood", "Crushing Belial", and "Fleshold"

Killswitch Engage - "Numbered Days", "My Last Serenade", and "Life To Lifeless"

Atreyu - "Ain't Love Grand?", "Deanne The Arsonist" and "Someone's Standing On My Chest"

Skinlab - "Slave The Way", "Anthem For A Fallen Star", and "Come Get It"

Samael - "Exodus", "Tribes Of Cain", and "The Cross"

American Head Charge - "All Wrapped Up", "Just So You Know", and "A Violent Reaction"

Meshuggah - "Rational Gaze", and "Perpetual Black Second"

Neurosis - "The Tide" and "A Sun That Never Sets"

Bile - "Legion", "Prime Time Loser", "In League", "Sex Reflex" and "Teknowhore"

Neurosis and Bile are two that I suggest if you're feeling particularly experimental.