If some is good, then more is better. And can there be any more “more” than a twelve-cylinder Aston Martin convertible? In Aston’s current lineup, only the DB9 and Virage Volantes—both with 2+2 seating—combine top-down motoring with V-12 power. (The DBS Volante is now out of production, but should be replaced soon by a convertible [...]