I've had excellent results with Brockton VA. It will take a couple of months to get fully assigned with a PCP if enrolling from scratch, so you may want to contact them prior to the move in order to expedite everything.
Civilian healthcare in southeast Mass has gone to complete shit over the past year or so, especially anything to do with Steward Medical Group. I now find that MOST VA healthcare is now superior. Even in some of the specialty fields, the resident MD's are supervised by very experienced MD's. At least that is my experience with Oncology and Gastroenterology.
Speaking of specialties, many of those will require an occasional trip to West Roxbury or Jamaica Plain.