I have a low mileage (@11k) '05 2.5 with every options except for the navigation system. Love the car but might have to give it up for a minivan. Having read so many threads on this forum and others about the rapidly declining resale value of the z4, I am not sure how legitimate are the edmund's or kbb's appraisals. Any input on how much should I sell my '05 2.5 for? Thanks

T