First I think you should get to know the players a little better. That would let you know which player(s) are your favorite(s).

As for a jersey, everyone has a David Ortiz or Manny Ramirez jersey. They are no doubt good players, but I think you should get a player that not everyone wears such as Jacoby Ellsbury, Coco Crisp, Josh Beckett, even Clay Buchholz or Kevin Youkilis.

You could also get an older player like some of the other answerers have said. Ted Williams, Carl Yastrzemski, Bobby Doerr are all good choices.

I hope this helps.