Dybala could be either Alexis Sanchez or a total flop. Unfortunately, if we are going to buy from a Serie A club, especially one owned by Zamparini, we will pay through the nose just because we are Juve. We're better off letting EPL teams overpay for these sort of players, and poach our foreign players from the Bundesliga, La Liga, or Ligue 1, where we will get a better valuation.
I'd bet that Dybala would cost around the same as Julian Draxler or Marco Reus (not saying that this should be the case), and if I had the choice, I would take one of the latter two. If Juve buy in Serie A, we will get hosed every time (Isla, Ogbonna, etc.)
On that note, with Reus out for the year, and Dortmund in the basement it may be possible to get him at a reasonable valuation.
Reus-Tevez-Shaqiri