Obviously, the player with the most potential is Wood as he has leaps and bounds more power but is still without full-time duty with Aybar at SS, Figgins at 3B, and Vlad at DH. Hill, if recovered fully from his concussion last year, is the safest as he's starting and slated to hit 2nd. Fontenot is now slated to be the full-time 2B and apparently will hit 6th though he lacks the offensive upside of the other two. Right now, I would rank them Hill, Wood, Fontenot with the potential to be Wood, Hill, Fontenot in a perfect world.
Someone maybe to add to this list is 2B eligible Ian Stewart. Stewart and Wood with their MI eligibility could be huge huge steals this year if they can get regular playing time. Huge.
This might be a good poll with the addition of Stewart.