I would have to say that Maroon5 and Kanye West were pretty damn good in their live performances, and for lesser known bands, Daphne Loves Derby rocked each time I saw them.
i would imagine it would be slipknot because of all the energy with 9 guys in a group, but disturbed was a pre kick a$$ live show. They've been known for having great live shows and they dont care about album sales, p2p, and all that they just care about putting on great live shows