Chris Christie seems to be generating more and more buzz, though there's no way he's going to run in 2012, so maybe 2016? Of course, it depend on whether he's able to win reelection or not, and whether he wants to potentially cut his second term short for the presidency. He's young enough that waiting until 2020 is a viable option.
His approval ratings are in the toilet and it would take a miracle for him to win reelection at this point. He would make a fine president, but, sadly, he can't win after being a one-term Governor.
Um, Rasmussen had Chris Christie at 57% approval earlier this month. Not exactly "the toilet".