Just a comment about Z06. Several participants in the Opus 911 commented that they drive Z06s, but they do not take them out in bad conditions. I have not driven a Z06 (have driven Z05), but I would be very surprised if the bad weather traction is as good as the 997TT. We drove in some ice, snow and heavy rain in Austria and the car was remarkable.

Sometimes the arguments on this Board are based on numbers alone IMHO, and not on real world, long term conditions.