Romney, understanding that no President in these times has the ability to change the game the way his supporters hope. Romney at least has a thorough understanding of the economic and regulatory environment necessary for a small business to succeed - maybe he could help a little. Huckabee would make social issues his priority, but that's just attacking the symptoms of an out-of-control government.
Realistically, the 2012 Republican nominee is highly likely to be one of these two, so this is a good question.