Per sportrac, the Sox should have $56mill to spend before reching the $208mill limit. Out of that $56mill, they have to pay the arbitration raises for whoever they offer them to from Betts, Bradley, ERod, Benintendi, Barnes, Hembree, Wright, and Workman.
If JD opts out, that number climbs to $78million. If Betts, Erod, Benintendi, Barnes and Workman all get offered arb and come in around $50mill, they still have some room to spend and stay under. Just not much room if JD stays put...