long distance buying advice?

I would not buy a car sight unseen. Not even a new one. Travel costs to inspect the car are just part of the purchase price.

If you decide to do the deal, tell them you will not buy it unless it is CPO'd. There are many-many Porsches for sale, just look at sites like autotrader.com. Buyers with cash, in today's economy, who want "luxury" items like a sports car, are in the drivers seat to negotiate a great entry price in the transaction.