In my experience, the A8 is far too big to be a supersaloon. My father has the RS5 and A8L and the combined experience is great, super luxury when travelling across Europe, but for journey time of less than 4 hours, jump in the RS5. I've not driven the A8L (age issues), but I regularly steal the RS5 and I couldn't imagine trying to stop a car that weighs any more in a tight spot. Its very nice being able to get to 155mph when overtaking (not that you can in the uk) but getting from 155mph to 40mph when an old lady pulls out of a side road? For some reason the extra 3" of leg room, and 20ltr boot space aren't so comforting! I know pricing is a bit crazy in the US, but here you'd pay a 30-40% premium for an S/RS model, and really its not worth it. Save the cash and buy yourself something else as well as a new car.