Though high-end vehicles now come in more shapes and sizes than ever, the midsize luxury sedan segment remains the heart of the luxury automobile market. Nissan's luxury division, Infiniti, has been around since 1990, yet it had no real presence in this key segment until 2003, when it launched the V8-powered, rear-wheel-drive M45.

The first Infiniti M45 was little more than a Japanese-market Nissan sedan that was rebadged and slightly "Americanized" in order to give Infiniti dealers something with which to compete against the high-profile German nameplates that dominate this class. But although it offered a credible amount of luxury and performance, the original M45's relatively uninspired design and cramped interior kept it from registering anything more than a faint blip on luxury buyers' radar screens.

For 2006, the current Infiniti M45 was introduced to wide critical acclaim. With substantially more space, a tremendous amount of technology and comfort features, and a bold, imposing exterior design, today's M45 is a high-tech powerhouse with plenty to offer midsize luxury car shoppers. Its performance capabilities have been raised significantly due to things like available four-wheel steering, a precisely tuned suspension and strong brakes. All told, the current M45 is a swift, stylish, superbly executed luxury sedan that should be considered with the top players in the segment.

Current Infiniti M45