Ah, the mid-life crisis convertible purchase. I'd like an Audi R-8, but I'm afraid I'd have to live in it.
Nice choice of a cool ride...could not afford that either.
But you could pick up an older well maintained inexpensive low mileage convertible for cheap...like a '93 Miata (wife's car) or like my '90 Mercedes 300SL.
Currently looking to replace the Miata with a well maintained used Mustang GT Conv. for her...and replacing the Benz with a 1960's car.