FWIW here is what I posted on another thread as my bare essentials I would want in return for Dunn:
As for the value most here think we should get in return for Dunn, I can't speak for everyone but my personal view is this would be fair:
1. I want a top three prospect from whichever organization we do the deal with. Position of this player isn't really of primary importance to me, I just want value in return if I'm giving up value. My worst nightmare in this whole Dunn saga is a quantity for quality deal where we get back a bunch of dreck that is supposed to overwhelm us in numbers.
2. Along with #1 I want either a steady (if not spectacular) relief arm or back of the rotation guy.
If I can't get 1 AND 2 then I don't deal Dunn at all. Pony up and pay him next year, sure it's a lot of money but what he brings to the table isn't easily replaced IMO.
Like I said above and will stand by, if you can't get at least that, you don't trade him.