Romney? Not gonna happen.
Bush? Good guy...too much baggage.
Santorum? I like him, but he will be demonized in the primaries.
Ryan? Maybe, but he has been associated with a failed campaign.
My money is on someone who is a governor now, who has some (but not too much) name recognition, and whose state has been a financial success.
If we are smart we will know that he/she is strong conservative candidate and not be put off by the stuff the left will trot out to split up the party.
Think about Obama...we knew he was a raving leftist, the other raving leftists knew he was one of their own, only the LIVs believed the media line that he was a uniting centrist.
We need the same thing in reverse.
Bush is a statist. The Bush family truly believes that ALL solutions to problems is an all powerful State -- see the ACA, Medicare Part-D, TARP, etc.
Bush is not at all a good guy. His smile belies his evil core.
All Statists are by definition EVIL.