Not even close for me (and I do like Sepultura), but definitely Pantera. I mentioned in the Metallica vs Maiden thread yesterday that Metallica was my introduction to metal, but then I heard Pantera and they took it to a new level (pun intended). I heard Vulgar Display of Power first and became obsessed with it. Love their entire catalogue, excluding the first four (pre Phil) albums which I have, but could never get into.