Warlock! With my setup I can CC just about 1 of anything. That being said, with the Paladin, I hardly ever find a need to do so.
I use a demo spec'd Warlock running a Fel Guard. I turned the taunt off, and put it on a castsequence rotation with my paladin's taunt.
It's an extra get out of jail free card when one of the DPS classes get in over their heads and the timer isn't up on the Paladin's taunt.