The 2006 330i seems very impressive...quote from their site,
Two inline 6-cylinder engines will be available, the larger 3.0-liter version producing 255 horsepower—an increase of 30 horses over the current generation. This engine is also the first 6-cylinder to use BMW VALVETRONIC. With infinitely variable valve lift in place of the traditional throttle butterfly, this system improves both throttle response and fuel efficiency. Like previous BMW VALVETRONIC engines, the gains in both horsepower and fuel economy are impressive.