As it turns out, limited-run super estates like the RS6 Avant GT can soar in value just like exclusive sports cars ...

The RS6 Avant GT is essentially an Audi ... white—modeled after old fast Audis—and an Audi Sport livery draped over a slightly modified shell. The front fenders and hood are carbon fiber ...

No, if you wanted a formidably fast all-weather family wagon it had to be an Audi RS6 or RS4, with which it more or less cornered the market. And one of the best was the C7 generation of RS6.