Hi, am wondering if the usual strategy of reserving the cheapest car and then counting on an upgrade at the counter will work? Can I haggle for an upgrade if I buy through Priceline Bidding? Husband has his heart set on a Mustang convertible, I am looking for way to get best price. Coming August 22 till 29 to LAX, 2 nights in LA then on to San Diego. Any ideas appreciated!