I think it's going to be Ryan,
I am ready to make an early prediction here, and am presuming that the current list getting vetted includes Ryan, Jindal, Rubio, Daniels, Portman, T-Paw & McDonnell. I don't see him seriously including a woman so soon after Caribou Barbie.
I think with the muddied message on health care due to the SCOTUS decision and the difficult branding of RomneyCare as good and ObamaCare as bad, he is going to be forced to put someone there that will excite the base, so bye-bye boring Daniels, Portman & T-Paw. He's going to be scared to nominate McDonnell because of the effect of the gynecological rape law on the female electorate.
So that leaves 3 spicy but still very respectable candidates. I think he is going to come to the conclusion that he will not get helped by Rubio with the Hispanic vote, and that he will win Florida in any close election. He will then have two candidates that have strong conservative records in health care. He will then look at Jindal as being a bit abrasive, not deferential to women (LOL, remember that infamous TV station in Kansas City that fired the anchorwoman because she was not deferential to men?) and from a state that he already has in the bag.
So he will choose Ryan, who is a charismatic, handsome (& tall!) and can help him win Wisconsin. He is going to be blind to the toxicity of Ryan's end welfare as we know it plan