I would avoid Kemp. He had a big contract season, then has had injury problems since then. Pass.
I would also avoid Beltran--the Cardinals were lucky with him. 37yo with no knees.
One problem the Red Sox have is they have so much money to spend they sometimes go looking for excuses to spend it. The result is they often block young players, with the excuse that "they aren't ready."
What they should do is throw money at their NEEDS. That means maybe McCann--a guy who can catch as well as hit. Perfect compliment to Ross. Then you have to ask how Lav fits in the picture. I don't know. But with those veteran pitchers, a good game caller and pitch framer (watch Ross work behind the plate--a master) is needed. Epstein missed the boat not signing Martin instead of Salty several years ago. Martin much better defensively and timely hitter like Ross.
Nap fits a need, and should be re-signed as a priority. They have the inside track on him. Ells and Drew both block young players. I say no, at Boras' inflated prices. Bogaerts can play SS, JBJ or Vic in the OF. An OF of Vic,Gomes,Nava,Carp,JBJ looks OK. Beltran would add depth, but at what price? Giving up on Middlebrooks and switching Bogie to 3B so early in his career would be foolish. They can lock up the left side of their IF for 10 years.