I'm not in CA so I don't know the $ conversion. But, I think what they're asking is a bit much. PROS: convertible M3, looks like fully loaded with Navi and sound. CONS: 6MT and high mileage. The CONS will really hurt the price of the car.
Don't get me wrong, I have a 6MT. I love it. But to most people it's not a option when driving a car. So that will be really hard to sell. I would negotiate hard with the dealer. They also know this.
Cheating death one day at a time with a defibrillator.