Sell them all.
Old Fiesta is a party, but a Festiva is what? Aspire is one of the worst named cars of all time. Ford pretty much admitted it was a POE36 M3 and it merely aspired to be a real car someday. Escort, well I guess could be several things, all better and more tempting than the car.
Since this answer will be deemed non-grassoots, then I will add that you should use the $500 you get in the sale to by a new autocross tire.
