Would not be surprised if the Sox were also shopping Beckett and Lester. They mispent a ton of cash since 2009, and they are kind of in a straight jacket in terms of being able to fix true holes because they are overspending on areas where they have cheaper system talent or bargain FAs. Right now, on the merits, their 3 most effective starting pitchers are Aaron Cook, Franklin Morales, and Felix Doubront, but they have had to drop Morales from the rotation because Buchholz, Beckett, and Lester are healthy. They will probably have to eat the rest of 2012 for Dice-K, too, once he is healthy.
BTW - I'm still convinced that Crawford would be find if you put him in a lefty-friendly ballpark with a big left field. That way, his natural pull swing would not lead to a ton of frustration and his make up speed would restore him to being a premium defender. Does not help that he may need TJ on his arm at the end of the year.