I test drove the F30 328i a couple of weeks ago. Coming from an E46 M3, I too appreciated the snappy low end torque. Physiologically however, I couldn't get my head around the four-cylinder engine. There's just something inheriantly less satisfying about the spool up of power. A free reving inline six just feels more satisying, there's something a bt artificial about the way this engine puts its power down.
Hopefully the suspension in the sports line is significantly more taut because the base model was rolling all over the place when I was pushing it through a hill pass.
Think I'm going to save a whole bunch of money and have a lot more fun buying a lightly used E92 335i