I bought the 2SS over the 1SS for the blind spot monitors, as much as I love the car, I find its outward visibility poor. The leather, the heated/vented seats, heated steering wheel, power seat memory, all that stuff didn't hurt either. I've never had mine on a track, I'm sure the better brakes and suspension make a big difference on track. Mine has the MRC which is awesome and damned effective. For me, I'd want to know for sure that the 1LE was WAY faster on a track, before I gave up the comfort and convenience of the 2SS, which imho ought to be fairly quick and entertaining on a track in its own right.
I just saw the Car&Driver Lightning Lap forget everything. Buy the SS 1LE Who needs blind spot monitoring & heated seats?