But my 2 favorite possibilities don't necessarily fit in the locking down the position for years category.
Cozart would be good if you want to develop Marte in AAA a bit longer. The possibility for an extension might even exist, though it's much more likely he becomes a FA and I'd think he'll probably be worth the qualifying offer.
Ian Desmond could be moved back to SS with the same idea, kept in a Corner if you think Marte is progressing as needed or moved as needed between them. It would probably be best to have him in a set spot going in to spring but the possibility of him becoming a super sub seems to me to exist. Even if he's split between a corner and SS that's added value. In any case, him Marte and O'Malley would combine to make me feel pretty secure about SS going into '17.