I am afraid the Sox will have to overpay for Garza. There are too many teams in on him because he is under control through next season. Also, the top rentals, Greinke and Hamels, are just that, rentals, and could sign extensions with their current teams which would remove them from the market. Dempster looks to be going to the Dodgers. Garza will be the top priority for teams like Texas and Detroit.
I would rather they explore the market for someone under the radar like Edinson Volquez of San Diego who is also under control through 2013. He walks a lot of batters but has the potential to return to a top of the rotation starter he was before TJ surgery. I'm not saying he would be my first choice, but in a season of question, he might be a wise choice.