Arencibia, or try to trade him. His value is at C, and you already have arguably the best catcher. Belt is a good pickup. See if anyone's drooling over Arenciba's amazing day, maybe you can get something out of it.
Yea If you can trade Arencabia I would. No real need to carry a backup catcher. All though I think Arencabia will be a very good catcher so I would not outright drop him as I think he is worth more in trade than Crisp or Jackson. Between the two of them, I like Jackson better all though you do get less pop. But I feel like he will make up for it in SB. Also at this point in their careers I think Jackson has more upside, or at least room to grow. Where as with Crisp, you know pretty much what you are getting. Jackson could surprise and outperform as he matures.