Cayenne GTS. I've put a standard S through it's paces and it's a lot of fun for what it is. I just feel the GTS has even better handling and looks immensely better out of the box. Forget the MB and Lexus. They are not enjoyable to drive at all - far too utilitarian.
'12 M3 6MT Alpine White + Fox Red Extended | '09 328i 6MT Space Gray + Black