What sizes are you planning on running? Are you on 19" or 20" rims? Coupe or Sedan?
I have been debating my set up as well for the last little while and am starting to settle in on PZeros as well. I also went with the P40s, in a 19" with 10.5" at the rear.
For tire size, I was thinking of 255/35R19 Front and 295/30R19 in the rear. Is that what you decided on?