I have to settle on one last keeper for my fantasy baseball team. Who would you choose from this group?

I would probably go with Cuddyer. With luck, the Twins will not limit Cuddyer in the outfield role, meaning he'll be eligible to play in other positions, which would highly benefit you. You don't want to keep Loney, because you already have two first basemen, Teixeira and Youkilis. Also, Cuddyer's the least injury-prone out of the outfielders there.