Apparently there are 3 different ways to go with seats for the 540iA. The standard 10 way with optional lumbar, the 16 way Comfort seat and the 12 way power sport seat with thigh support. The sport seat is only available with the sports package (I assume). Which seat is worth going to (maybe all are fine and not to be concerned about either one)? I would be concerned about the sports package suspension a little, but I would get it if I knew the seats were more comfortable and supportive. Does the sport seat electrically adjust the thigh support or is it manually done? Thanks ahead for any input.