if you are going to drive the z in the winter, you should get a dedicated winter wheel set up, rather than all seasons.
read this thread regarding winter wheels/tires:
My Winter Rims/Tires Setup: TRMotorsport C2 + Blizzak LM-25 w/TPMS w/pics (AK370Z)
and here's one on regarding noise:
Cabin noise
for summer tires, the michelin pilot super sports are popular, and what i plan to replace the stock re050s with when it's time. there are a number of options though.
