The band that really does it for me is Pantera. Vulgar Display of Power and Far Beyond Driven are two of my favorite albums. Also Tool, Beatles, STP, Adolescents, and of course AFI. If you haven't heard the new album you should probably check it out. They're a punk band but the new stuff was arranged very nice. Hard riffs, clever licks, and a good delivery of the lyrics and I'm good to go.