I think Cano+Hughes+Duncan probably does it. Hughes had a rough start, but you can see the talent is there, and more importantly, he's taken some of his lumps already, so he's MLB ready. Horne is slotted for AAA next year. They could use some serious life out of their DH spot. He won't hit for a high BA, and he'll K a lot, but Duncan does have good power.
Would I trade Ellsbury/Buchholz? Sure thing. It would hurt losing an exciting young CF/leadoff type and promising young pitcher, but look at what it would do to the rotation. Santana and Beckett plus good potential for improvement from Dice and Lester, where do I sign up? I don't think an extension would be hard to hammer out for a big club, then he's yours through his prime.
Ignoring the Dodgers for a second, who could offer more than the Yankees? Well, if Cano, Hughes, and Joba are off the table, then just about everyone. Those are your three most tradable commodities.
Now including the Dodgers, they and the Angels probably have the most spare change to get it done with a gangbusters package.