I forgot to mention, I don't want to spend more than 100k€, otherwise I think I would take a GTS...

I will not drive fast, lots of highways limited to 110km/h and 130km/h, and the rest will be city driving.

Thx RC, so to your mind the price of the Turbo is worth it compared to the 4S. What about the service cost, and most importantly the depreciation of the Turbo after a year and 30.000kms compared to the 4S ?