Who I'd LIKE to see?
John Huntsman. Without a doubt. Though it's unfortunate, because I think he was the prototype for how to have beat Obama in 2012. I believe 2016, if he got the nomination, would actually be far more difficult for him.
However he's without question the guy I would like to see get it.
Experience? He's got executive level experience as a Governor. He's got Diplomatic experience, specifically dealing with a top foreign actor in China. He has private sector experience running a corporation and non-profits. He's got White House experience serving in the Reagan and Bush administrations.
Record? Under his tenure he helped make Utah one of the top 3 places in the nation for business. He passed record tax cuts. He lowered the amount of government spending in his state as a percent of it's GDP. He passed consumer focused health care reform.
Views? He's a strong fiscal conservative, a moderate social conservative, and a forward thinking militaristic thinker. On the thing he's "moderate" on socially, Illegal Immigration is the only one that bothers me (gay marriage does not). Of that, his stance actually is a reasonable one....secure the border first and ONLY then should we move forward with looking at what to do with those that are here in the country. He's a pragmatist and one not slaven to ideology in any direction. For example, he breaks from the GOP in believing that man made global warming is an issue, but breaks with the Democrats in believing that significant federal action is not needed that will provide a hinderance to job creation in our perelious economic situation. In terms of the military, he's in favor of a strong and able military that can project strength while at the same time believing we can modernize and adapt to the realities of the 21st century which would allow for decrease in personnel needs and costs, allowing a reduction in spending.
Electability? He's fiscally sound enough to overwhelmingly win the governorship twice in one of the reddest states in the Union, while at the same time being moderate enough socially to not alienate moderates/independents immedietely upon hearing about him.
However...after McCain and Romney in 2008 and 2012, two individuals I believe are not good equivilents to Huntsman but have been painted by such by both sides of the media, I highly doubt he has a significant chance in 2016.
Out of those with at least an outside chance, I would like to see Rand Paul at the current moment.