The Speed 12 eats the PD cup. I started from last in each race (too lazy to qualify) and won every race by close to a lap.
The Zonda C12S is another interesting one to try.
From what I can see, P001 and 002 are very similar. I haven't looked too closely but I think the kerb weights & dimensions are just about the same. HP is the same too, but they have different engines. 001 is a V10 naturally aspirated and 002 is a turbo V6. With an oil change as soon as you get them, they're both good for about 830HP.
As for settings, I leave everything as it is and just increase camber by 1 degree front and back, and set the damper rebound to 10. Oh, and the TCS and VSC can go to 0.
In this setting, I can take corners at least 30 - 50 kph faster than cars like the GT-0ne or R390 race cars. Max speed at this setting, about 365kph. The things turn on a dot! Braking is phenomenal too. It also slipstreams like a king!
BTW: As far as I'm aware, you only get P001 from the PD cup. P002 is won through the Formula GT championship.