Market overview: Which Porsche models are currently the most popular on the used car market? AutoUncle has analysed 44 used Porsche cars that are currently for sale at 43 dealerships. The three most popular Porsche models as used cars are: Boxster, 911, 911 Carrera S. Prices start at around £7,750, and the average price for a Porsche on today’s used car market is £20,582.