The prices of the 540 vs. 530 was not that much different. I had my eyes set on a non-CPO Sterling Grey 540i with a 6M. A quick look at gas prices, insurance rates (yes, the 540 means a higher premium) and the lower mileage 530i became a more sensible choice. I thought that I'd hate the Steptronic but I'm actually enjoying it. I put 3,500 kms during my 20-day vacation and purposely took some of the back roads. The trips were a little longer but nevertheless, I can't wipe the grin off my face. Still to this day, the best car I ever owned.