When the current BMW 3-Series debuted in 2012, it lacked an entry-model to woo buyers stepping into the brand for the first time. That hole was filled the next year with the 320 sedan, which remains the most affordable route to a new 3 Series. If you can live with the 180-horsepower 2-liter turbo, no other concessions are necessary. The 320 may lack a few standard features (power seats cost extra), but almost all S-Series options are available, including all-wheel drive and a premium leather interior. You also get 28 mpg in combined driving, something the more expensive models can't deliver.