Grenouille
Super Freak
If Ted DiBiase jr had been handeled well or different from the start (i think Legacy was huge disapointment, it had so much wasted potential) i would of liked him to take the streak, it would give him just the right edge to place him outside of 'just another 3rd generation' and give him a legacy in his own right. However since he is mostly a mid-card flounderer i would love to see Daniel Bryan or even Wade Barrett given the task, a more established superstar like CM Punk would also do well with the acolade since i think he is the best worker in the WWE for a long time his heel run second to none even beating Jericho's last heel run which was fantastic for a while.
After watching him for a while DiBiase Jr. is bland as vanilla ice cream. The apple fell far from the tree on this one. Maybe his brother Brett will be better if he makes the big roster.
I don't know if there is anyone who stands out right now as the streak breaker. I would guess someone established will eventually do the deed from the Cena, Orton, Punk area of the roster.