Fields is a MUCH, MUCH better option than Murphy. It's entirely possible Fields could find a spot in the Chicago outfield next season, whereas Murphy has a long ways to go to even be a 4th OF in Boston. Go with Fields if no one else is available.
OF (x3): CarGo, M. Bourn, D. Jennings
UTIL (x2): E. Encarnacion, C. Hart
BN: Cuddyer, C. Ross, J. Montero
SP: Price, Gallardo, T. Hudson, Lester
RP: Chapman, Jansen, Rodney, Putz, Cishek, Bailey