For me it would have to be Judas Priest. Halford's Live Insurrection is one of the best things ever put to record, and having the Painkiller line-up back together is like a dream come true! Just imagining a show like that on LI but with a better setlist and some Painkiller material gets me hard, Ooohh Yeah! Fuck I hope they tour here sometime in the next two years. Throw in Dungeon as support and you have one KILLER tour right there.