Is Jack worth the $750k he wants? I don't think so. I hardly think he deserves much of a raise on his $550k anyway.
Is Dusty worth $650k? Maybe conditionally but not ATM. 500-550 sounds more reasonable.
You don't want to let these guys go, but you can't set a precedent that allows them to ask for however much money they want. There's a whole team to think about. If they won't sign for less, we'll be forced to trade.
I'd offer them both to GWS. Jack for Pick 1 (Boyd) and Martin for J Cameron. Maybe a pick too.