How about just Staal and a 2nd for Ladd and Versteeg?
Hawks get their young second line center their fans seem to want, and the Pens solve their top six wing needs long-term.
As for the initial trade, Hawks laugh and hang up.
I feel like we might have to at least add in a mid-level prospect to get that done, as valuable as Staal is the Hawks are giving up a good bit to get him there. CPZ or Veilleux maybe. I'd still do it though, Versteeg would be very good in our top 6 and being able to add Ladd to Caputi and Tangradi would give us quality, young, cheap LW depth.
Hell, if it takes a little more than that to get those two, I'd still consider it.