Whether or not you sell the car, take it to Orlando and get a quote from Carmax. I have sold them 2 BMW's and got a much better price from them then a trade in or what I could sell it for on my own. There are 2 of them in the Orlando area. One near the airport and one in Sanford. I have sold them a 740 and a 335i convertible. It's worth the trip and they five you a non negotiable price in about 45 minutes that's good for 7 days. A car like yours would be a quick sell on their lot so I would think you would get a good price. I know I did. But don't pass up the chance.

Good luck. (I now have a 11 328i convertible after they bought my 08 335i convertible.