My first choice is to keep Devers at 3B for at least another year or two to see if he can improve enough to not be a liability on defense.
Now, if we lose out on JD Martinez, I'd rather have Moustakas than Hosmer. He is likely to get less money and less years, and he's better than Hosmer. That is one scenario, I'd consider moving Devers. The second one might be after 2018. We could sign Machado and move devers to 1B, assuming we just sign a stop-gap 1Bman this winter.