[Unobtanium-inc]

As far as where to sell it, that's up to you based on you doing research on what platform works best for you. But there are a couple of rules to remember when you go to sell your car.
1. It's you car, your rules, and if the buyer doesn't like it, sell it to the next guy. You are selling a Porsche, so there is a long line of guys who want your car, it's not like selling a lawn mower where you have to seal the deal with the one guy who answered the ad. So if you aren't comfortable with anything a buyer wants, just say no, it's your car, your rules, a serious buyer will respect this and jump through your hoops to get the car, scammers and idiots will go away, which is what you want.
2. Do it on your own time frame, don't meet someone at 10PM to sell it, or skip your kid's birthday party, tell buyers when and where you will show it.

Bottom line on all this is don't let anyone bulldog you into selling the car for any less than you want, or when you want, or how you want. But also remember that if someone is serious you have to respect that so if they want a PPI, let them, if they want to drive it, let them. Hope this helps.

---Adam