I'm about to get new tyres too & thought I would stick with the stock sizes rather than the wider ones that many seem to go for.
Trouble is there seems to be very few choices. From what I can gather, PZeros aren't available in both sizes, so that leaves P1s from Pirelli. I had one place recommend these & another say you may as well buy Kuhmos as they are similar & cheaper!
I can get either the Super Sports or Pilot Sport 2 in the Michellins; seems everyone likes the SS, so I think I'll go for those.