I'm going against the grain here. I'd take Chris Davis for Castillo or Chirinos. One thing that hasn't been mentioned is that Davis does have some position flexibility. From what I understand, he's OK defensively at 1B. He also played 3B primarily when he was sent down to the minors this year, and has made progress there according to Rangers personnel. He also played a couple innings in LF. So, you're talking about a 24-year old, with all kinds of power, a great minor league pedigree, and with the ability to play 3 different positions where he's not going to kill you defensively. Best case scenario, you can get a young power hitting starting 1B. Worst case, you get power and flexibility off the bench. Getting Davis doesn't prevent the Cubs from still going out and getting a 1B (probably Pena or Nick Johnson on a short term deal) because he doesn't cost a thing. I think this is exactly the type of move the Cubs should make. If it's Chirinos, he's older than Davis and profiles as a backup C.