What about Assemblyman Jay Webber (R-Morris). He seems like the safest, conventional choice for a governor. He should have ran for Senate in 2012; could have defeated Menendez; and coud have been a 2016 GOP vice-presidential contender. A safe choice for whoever the GOP nominates in 2016.
I think he is too conservative to run statewide. He is a good fit for Morris County for which he represents though. I looked at his ACU score and it was a perfect 100 for 2012. That's just too conservative.
I think Donovan and Beck would be the front-runners on the R side. Kean Jr. could be a sleeper. On the D side Sweeney and Wisniewski would be the front runners. McKeon and Bollwage are sleepers though. The others I don't think run on either side of the aisle.