1988 BMW M5

The M5 might not have  the original super sedan. It was not even the first hot 5 Series. But just as the GTI is synonymous with the hot hatch segment, the M5 became the benchmark by which all other super sedans were measured when it rolled ontothe scene in 1985. More than 280 horsepower from the racing-bred M88/3, perched with beefy suspension upgrades and huge (for the time) alloy wheels mated to a limited-slip differential. At a time when 'fast' cars ran 180 horsepower, BMW's first M offering in the sedan range might as well have been a spaceship.
BMW also promised limited production for the US market - and in fact only 1,239 were produced for the US with the slightly detuned S38. Unfortunately, that was 700 more than BMW had promised, and that led to a legal battle. It didn't take long for the M5's reign of power to be eclipsed either; initially by the successor model E34, by then the entire range of new V8 models had come onto the market, from the Audi V8 quattro from 1992 to the 500E. Values fell quickly as these old-looking (even if new) boxy rockets fell out of favor, and they stayed there for quite a while.
But of late the appreciation for all things '80s M has grown much greater and while the E30 has grabbed the headlines as a market star, outside of the M1 it's the E28 M5 that's been brought here in the fewest numbers. Even fewer have survived, and clean examples down the lower mile can be difficult to find. This one seems to tick all the right boxes: