Specs: 420-horsepower, 5.6-liter V-8

Redesigned for 2011, the Infiniti M luxury sedan is now more powerful and more fuel-efficient. With a starting price of about $57,600, the Infiniti M56 is powered by a 420-horsepower, 5.6-liter V-8. The M37, which starts at about $46,200, is powered by a 330-horsepower, 3.7-liter V-6.

Both M classes are paired with a seven-speed, automatic transmission and are available in either rear-wheel drive or all-wheel drive. Standard features include leather seating, dual climate control, power front seats with heat and cooling functions, electronic stability and traction control systems, keyless entry with push-button start, six air bags and active front head restraints that automatically adjust during a collision to provide support to reduce whiplash.