For a point of reference on value, insurance gave me right around $10k for my 07 GP GXP. That was with about 20k more miles, but like yours was super clean. That was also with a few hundred extra bucks for having brand new tires and a couple tiny mods. I'd imagine yours could pull another thousand or so given the lower mileage?

With that said, I would've struggled to actually get that private party.

 

Looks pretty clean and like it's been taken care of well. Your's is one of the few I've seen other than mine where the leather seats look basically new and aren't all cracked, torn, etc. Realistically, probably $10k tops if you find the right buyer - not impossible but you'd likely struggle or wait years to get near that (like bumpin said). KBB is showing $8,700 high end. Low mile cars are a little more of a unique situation. It really comes down to what somebody is willing to pay.