Most fun 2-seater 'vert you can buy. Period.
My 2008 Boxster S has reached the maximum depreciation- it has already depreciated by almost 50%, and shouldn't really drop much more. But, because these are weekend and fun cars, you can get one with VERY low mileage. Because they were expensive new, they are generally maintained well. And honestly, looking at 2 seater sports cars, there just isn't anything out there as much fun. The Audi TT & BMW Z3 both understeer, the Benz SLK lacks the sporting intentions, and the FRS/BRZ twins are lacking in the HP dept. Even considering Nissan GTR, BMW M3, Audi S4, etc; they are all just bloated compared to the Boxster/Cayman. It may be blasphemous to other P-car owners, but even the 911's I tested weren't as fun as this little mid-engine car!