With the Dodgers I think it's Rushing plus two additional top 100 prospects at a minimum to make the deal. Duran has basically three years of control left, so the return needs to be extra.
People keep talking about River Ryan, but that's a very big gamble. He had tommy john surgery last August, so likely won't pitch until next season. Who knows if he comes back from that.
I'd want Rushing plus someone like Eduardo Quintero and then another prospect.