My opinion: I definitely give up Kennedy, Melky, and a third-tier player or even Jose Tabata. 

Miguel Cabrera is a 24 year-old with A-Rod-Manny-like numbers. He is also a known commodity to Joe Girardi and both are known to like one another.  Who knows what Ian Kennedy is going to be? He may be great! But we know what Cabrera is right now: a bonafide elite slugger who hits for power and average.  

My only concern is his conditioning. Cashman may kick himself for not throwing in Kennedy to get this done.