I would say the 76ers or Pacers. 76ers fought to game 7 with the Celtics kept games close and almost made it to the Conference Finals. They're a very young team and have tremendous potential.
As for the Pacers, I think Roy Hibbert is developing well. If he can score inside and play good defense, the Pacers have a better chance against a powerful team like the Heat. Also, Darren Collison and George Hill are quite athletic too.
Hornets with their stacked rookies this year will definitely surprise some people. The Nets now that they have Joe Johnson will be contenders. And I have to agree that the Kings with Thomas Robinson will do well also
Lakers need to pick up better players to help from off the bench. Because their bench is horrendous right now. As for the Mavs, yeah they're getting pretty old too.
What? I always thought he was going to sign with the Knicks? But Nash to the Lakers. That's a pretty good pick up, Nash might be old but he plays as a REAL point guard. Sessions can help off the bench and also learn from Nash.
Jason Terry looking at the Celtics
I don't know how that's going to work out. Since they have Ray Allen and Avery Bradley too.