Conservative: A "three-legged stool" conservative (fiscal, social, military), someone who "gets" and can articulate Tenth-Amendment federalism.
Competent: Someone who will govern effectively.
Electable: Someone who can appeal to enough voters "in the middle" so as to beat Obama in the general election.
Up to this point, none of the names mentioned "jumps out at me" as the obvious and outstanding choice on all of the above points. We'll see. That's why we have campaigns and primaries.
the only 10ther on the stage atm is Palin