Depends. By smarks? John Cena, easily, for reasons that have been beaten to death in defense of him.
In general? Funaki. Shame not many will ever see his work in Japan. He's very, very good when given the chance.
As for the others-The Miz sucks, Henry sucks, Thorn's ok, and Val Venis was an average worker who was the product of a great gimmick, that however only suited the Attitude Era, so he's out of the equation now as well.