Pence is on my short list, along with Cruz, Palin, Santorum, and Jindal. If he is the nominee, I could not only vote for him but gladly campaign for him.
I like three of your choices. Santorum seems very immature to me. I think Dr. Ben Carson should be on the list also, but I am not comfortable with some of his past opinions on the Second Amendment. I also like John Bolton, but he has abortion position problems.