If $$ not a problem (I think this case no $$ problem)
I
think PS2 is a good replacement for the CsC2, it is quiet and yet
grippy, ever taxi ride in a BMW330CI with PS2 for rounding. Just
that it wear out too fast (25,000 to 30,000 km according to my
friend)and it is too ex for me, I do travel a fair bit to the
north. I'm using 235/45/17 on my E39.
Personally tried AVS Sport, SO3 and F1 GSD3. Then change back to
AVS Sport, due to best value.
SO3 is a notch higher in the dry than AVS Sport but not performing
in the wet, it will be dangerous if you drive as hard in the wet.
IMHO AVS sport has smaller difference between the wet and the dry,
its is quite a all rounder and much cheaper than SO3 (SO3 wear out
faster too, about 30,000km; AVS Sport can take up to 45,000km). It
cost much more than AVS too.
F1 GSD3 out for me cos of noise. F1 and AVS Sport both are noisy
tyre but F1 noise starts at 20,000km while AVS starts 35,000km.
Both almost same price and similar in performance.
The above is just a little feed back from my personal experience.
Do not know P Zero. 
