You are a long, long way from a buy back. You have only had them address the issue one time and you want a buy back for a new check engine light? Give them a chance to find the problem. When and if the issue repeats over several months and attempts to fix the car fail, then you can think about...
I think you should get the Prius. If the Mustang just doesn't speak to you, get something that does. For me, I don't care if it has a sound system or not, I'm not buying a car like this for the stereo. The music I care about comes out the rear of the car.
Better financing than 1.9, 2.9 or 3.9? I doubt that. And deals on MSRP? They are already at about 10% off, sometimes a little more. How much better do you think it may get?
don't mess with him. He wants to pay MSRP or ADM and then be hurt when other people know how to work a car deal. people like that make it easier for smart buyers to get a deal because the dealers make so much from those who just pay the asking price.
have you heard these cars with a resonator delete? sure you want to cut up a brand new car? seems a little ricer to me, these cars sound so good stock.