Infiniti M56

The 2011 Infiniti M has already won a slew of awards, from best premium-priced interior (Ward's Auto) to Top Safety Pick (IIHS). So even if it weren't a massively updated, improved, and refined version of Infiniti's already impressive M sedan, the 2011 Infiniti M56 would deserve our attention for the Best Car To Buy award. But it is all of those things--and when powered by the potent 420-horsepower and 417 pound-feet of torque supplied by the 5.6-liter V-8 engine, it's a beast in the performance category as well. Mated to a seven-speed automatic transmission with manual mode, rev-matched...