Slotted between BMW's 5 and 7 Series sedans is the 6 Series line of coupes and convertibles. While its numerically lower and higher kin constitute practical transportation for the well-heeled, the more exclusive 6 Series models are for buyers more interested in style and image. They offer heaping portions of both, and a hearty helping of BMW's stellar driving dynamics, especially in the high-powered M variants. With roots tracing to the late 1970s, today's 3rd-generation 6 Series has raised the ante for grand-tourers. The 6 Series models' power and looks enable them to stand up to the Jaguar XK, Mercedes E-Class Coupe and Audi S5 in this niche segment, while buyers desiring more space can have it in the 4-door, 5-passenger Gran Coupe variant.