A problem I love to solve. Answer: the Rogue Engineering M3 wagon. Except for the wheels and perhaps the color, this car exemplifies the term "sleeper." Rogue went out of their way to attain all of the factory parts for the thorough conversion, so the car basically exists as if it were built at the factory. And it's for sale, too, for less than many sedan Ms, plus it's infinitely more unique. If that rich widow won't loan me £695,000 for that McLaren I wanted, maybe she'll pony up a relatively paltry $48K for this great estate. Hello, rich widow, are you out there?