I wouldn't part with Lavarnway or Middlebrooks, and without those two the deal breaks down.
Either Middlebrooks or Lavarnway, or possibly both, could be on the roster next year depending on what happens with Mr. Kevin "always-getting-dinged-in-the-field" Youkilis, as well as Ortiz and Tek. If they decide to DH Youk to keep his bat in the lineup, Middlebrooks is the logical replacement, with perhaps Lowrie or Navarro as a stopgap until he's ready. If they decide to play Youk in the field, Lavarnway could play DH and backup catcher. As things stand, both are viable injury insurance and could come up big next year.