Riccardo,
It is hard to add to the great advice already given, but here it is anyway:
Porsche is a driving experience that can not, imho, be equalled by anything else, even the exotics, for any of the air-cooled 911 models. I have owned 5 of them from '78 thru '95, and every one was more fun and more challenge than I could ever hope to meet. Very cool technology and performance that was a pleasure every time I turned the left-handed key. The experience is all about driving: steering with your right foot and trying to keep all that torque under delicate control.
That said, I appreciate my 230sl more than any of them. It is fun to drive, yes, but it obviously has nowhere near the performance. But it has HUGE grin value, for me that is a function of style, driveability, reliability, elegance, engineering and just plain fun.
Someday I may revisit a Porsche, it would have to be a turbo from the one of the last air-cooled models, but for now I am very happy with the pagoda.
Oh, did I forget to mention the Boxster? Sorry, that is not a Porsche, not even close, imho.
g
'64 230sl, fully sorted out...ooops, spoke too soon