Im going with Artest because unlike the players mentioned above (Except KG and lets not be greedy hes gonna get the MVP) Artest can guard guys from 1 to 4, physical or quick, and he has something the others dont......that intimidation factor. Like it or not that is apart of NBA style defense. If a guy is not sure if the defender is going to thrash them to the ground they think twice about going to the rack or posting them up.