[Porsche9]

I'm looking at a lightly optioned 2006 Cayman S with 79k and the only service history is from carfax (it actually surprising complete and almost always dealer serviced). I'm trying to determine what a fair price is for the car before making and offer and getting a PPI done. The used car dealer has it for sale and orginally was asking $24k but after having the car on the lot for 120 days has dropped it to $18k. $18k based on what other like Cayman's for sale seems like a decent price with some sellers asking as much as $25k for cars with similar mileage. Looking at several online car pricing tools it's all over the board. Anything from $17k for private party to $23k for dealer.

What are your thoughts on price? Thanks.