We hashed out the 10 Best Cars (Car and Driver™ 10 Best [spoiler alert]), also buried in the January 2010 issue of Car and Driver™, FWIW their 10 Best Engines (alphabetical):
BMW twin-turbo 3.0-liter inline-6 (gas and diesel),
300 HP (265 HP in diesel)
found in 135i, 335i, 335d, etc.
BMW...