Mazda MX5 Any Mazza is future proofer with a wonderful record for build quality and utter reliability, but the 5 is in a class of its own it comes to sports car solidity. It is the best selling roadster of all time for several reason, but the good driving vibes are value are just a couple of them. These should last forever 2015 2.0 SE convertible with a Euro 6 engine you will pay £------  (The prices are always changing ask the Future Proof Cars team for up to date prices and links to examples for sale).