This would be a good deal for both teams. The Mets need a stud and Manny is one of the best hitters in the game. The Sox need a SS, Matsui would be decent. Reneteria for 10 mil is crazy. O. Cabrera is about the same calibur player as Matsui, but Matsi is cheaper. NOW the reason this would be a good deal for the Sox is that the Sox would then sign Beltran for less money than Manny. So really the deal is:
Mets get Manny
Sox get Beltran, Matsui and save money.
Of the course the Sox should not do this unless they are sure Beltran would sign with them.
Just my take,