Get the car he wants, BUT please keep in mind and let him know, Mustangs of that time are NOT good in the winter.
No traction control, and a light back end.
I had a 95 GT, fun car for the time, but in the ran I could get it to go sideways at any time I wanted and many times I didnt want to.
In the snow, forget it. Yes, it can be driven in the snow, but you will get stuck, A LOT.
So just keep that in mind. Maybe go test drive a mustang right now, just to see how it handles in winter.