kmag54,
You stated that your base is a 2008 with 1300 miles on it. Then you mentioned a CS (auto) with 850 miles on it. Is it also a 2008? I don't want to assume anything.
If it is a 2008 CS with 850 miles on it then it sounds like a pretty fair price to me for the car. Do you have any cash put away that you can help offset some of your negative equity?
I had a similar situation back in 2007. I traded in my base 2007 (manual) for a 2007 CS (auto) but the dealer gave me full payoff (and some) for my base and I gave them cash for the difference.
I do have to be honest with you and tell you that I LOVE the CS more than I did the base. Sometimes I miss the actual "shifting" but then again I also have some heavy traffic in this part of Florida that offsets that with NOT having to shift!
I drive in "manual" mode almost all the time and love it. I have several friends with Cayman S' and they always comment on how hard my car pulls even though it is an auto.
The
Borla and desnork probably helps!