I wish the local car dealers around here were worth a crap to deal with. I might consider trading in the C6Z for a C7Z IF I could actually get a deal, and IF GM got the heat soak problems resolved I had read about when the C7Z first came out.
Honestly, I SERIOUSLY hate the negotiation BS that car dealers put you through just to try to buy a car. And trying to do a tradein long distance just makes it worse.
But anyway, in your case, will you be trading in the Mustang? Or trying to sell it outright? That should bring in some coin for the vette you want to pick up.