I choose Challenger. It's not out, but will be seen as a muscle car the moment it arrives. The ZO6 is a true sports car, as are all Corvettes so I leave that out. Otherwise, it's by far the best on the list where performance counts. The Mustang GT500 is cool, but too expensive and the GT just isn't the powerhouse a Mustang should be imo(though it will run mid 13's stock) and isn't really a muscle car. The Charger is nice, but I'm already tired of it. The Camaro will be cool too, but like the Mustang, I don't consider it "muscle" ... It's a ponycar. GTO is really nice, but it's a goner and there have been too many silly issues with it along the way. At least that's what I've read about it.