In my opinion, the most logical candidate is Detroit Tigers coach Gene Lamont. Lamont has had two prior major league manager jobs. Lamont combines experience and success. (Finishing 1st two straight years with White Sox in 1993 and 1994; the latter not counting because of the players' strike.) He has also remained on Jim Leyland's coaching staff for all these years similar to when Leyland was manager in Pittsburgh. Lamont would fit in as a quiet voice of the organization that wants their manager to be quiet. Plus I think Lamont deserves another chance to be a major league manager since he was given such a bad team in Pittsburgh.
If the Red Sox turn to Valentine, it would be a sign that the Red Sox have chanced their philosophy. Maybe its time. But lets not forget this is an organization that has won two World Series in the past eight years and only the Cardinals have won that many in that time. So the philosophy has been successful. Perhaps the clubhouse issues last year require a no-nonsense force be put into place. And Valentine would fit that mold. Similar to Lamont, he deserves another chance to be a manager. Valentine would be more of a Ralph Houk than a Don Zimmer, as far as prior success; both of whom were decent Red Sox managers.