Mazda's most popular model, the Mazda3, is completely redesigned for 2014. Four and five-door versions are available in four trim levels, starting as low as $17,000. An increase in wheelbase allowed for more interior space, while the exterior length of the car is actually a little shorter. A 2.0-liter engine with 155-horsepower is standard with a 184-horsepower 2.5-liter as an option. A six-speed manual or six-speed automatic transmission are available.