The Infiniti M successfully blends aggression and sophistication for stylish visual flair. Its rosewood-trimmed interior is luxurious, with comfortable seats and a full array of standard safety equipment. Every model features the requisite luxury accoutrements, including keyless push-button starting.

The M35 can be rewarding to drive. Its V6 engine is one of the most powerful available. Enthusiast drivers will particularly like the M35 Sport, which features a firmer suspension and active rear steering. The V8-powered M45 delivers even stronger acceleration; the M45 is also available as a Sport model.

Those who live in slushy, snowy climates should be wary of the Sport versions of either M, however. These cars are equipped with sticky speed-rated tires, which are designed for lots of grip on dry pavement, and aren't much good for anything in snow. Better to choose the all-wheel-drive Infiniti M35X, which comes with general-purpose, all-season tires. The M35X adds an element of confidence and security in sloppy climates, without sacrificing the smooth, quiet running drivers expect in luxury sedan, or extracting a significant toll in reduced fuel economy.

Sedans in the $50,000 range comprise one of the most competitive chunks of the new car market, loaded with good cars like the Audi A6, BMW 5 Series, Cadillac STS, Jaguar S-Type, Mercedes-Benz E-Class, Lexus GS, and Acura RL. The Infiniti M leans toward the sportier end of this spectrum, particularly in Sport trim. We strongly recommend a look at the Infiniti M35 or M45 for anyone looking for a car in this class.