I don't think there is a favorite. You could put the top three in any order and make a good case for all of them.
But really you guys are worrying way too much. It's only December, and there's a good chance we sign Teixeira, and maybe even Lowe. Good thing you guys aren't the GM or we would have just traded the top five prospects for Peavy.
Well let's see, right now the bullpen is: Papelbon, Okajima, MDC, Lopez, Ramirez, Littleton. Assuming we use Masterson in the rotation and have a 4 man bench, there is an open spot for Gonzalez to take up.