I ran 986 calipers for a while, which use the non-PP rotors. They worked fine until I put the IS38 in—the extra speed was a bit too much. So, I would say that the non-PP rotors are fine for a while. You can put either the GT3 or RS3 scoops on the arms to get more air in. I'd also agree that you should get better pads and fluid too. I'd also do both. If you just swap the pads and leave the fluid, you're going to just trade a hard pedal with no brakes for a soft pedal with no brakes.
Also, as far as pads go, I'm not a fan of "dual use" pads. In my experience, dual use pads are just kinda lousy on the street (in terms of wear, cost, and dirt...they'll stop the car fine though) and the track (in terms of performance). You can get a "mild" track only pad (i.e. Pagid RS29s) and they'll be just as good on the street (except maybe in winter, depending on your climate), and actually work on the track.