How about Rick Santorum for VP with Romney? It doesn't give the ticket geographic balance, though Pennsylvania is technically not part of New England, but it certainly provides good conservative credentials as well as great credibility in the WOT.
I would love to see Rick Santorum get his just due, probably not VP, maybe Supreme Ct, or Homeland Security Secretary. That would please me no end to see the man that knows so much and has warned us so many times about Islamofacists be in a position to really make our safety and security Paramount.