If I was thinking of selling my 2012 Cayman S Black Edition, how do I determine a realistic asking price? There aren't many 2012 Caymans for sale. The only one currently listed as a Black Edition in the US is definitely not one. How can I determine what it is worth? Does the fact that it is a limited edition car (number 209 of 500) make it worth more? Starting to itch for a GT3...