I have a p1sc. I personally think that the step-up ratio fo this blower matches the power band of the 96-98s pretty well. You see boost a little bit quicker with this blower than with the other centri's. The intercooler is a major plus as well. My car pulled 325 rwhp/376 rwtq. I have no track times yet, but the car is a completely different beast on the street. I've seen few vortechs with similar hp numbers for their mods, but the torque is almost always lower. The Novi 2000 is probably too much blower for our cars. I'd get one only to blow my engine and replace it with something better.
The other s/c I would seriously consider if you don't plan on changing your heads and going for 400+ rwhp in the future is the SVO/FRPP/roots style blower. Most guys seem to be able to put down ~300 hp and they are torque monsters. Great low end fun for the street...