from what i have seen, high teens to mid twenties is not uncommon for these cars providing the car is basically pristine. I would check Ebay, their prices are usually high, but then again, you could sell yours there, so it would be market correct.

Good luck with your surgery and recovery!

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In the Garage:
'84 300SD, 85K "The Princess"
2011 BMW 328I XDrive, DD