dude the p3 subs are awsome. from the tests i have done personally you can dump over 1000 watts on them and they will hammer in the right box. i will never by another kicker comp or comp vr sub again. pure trash, they cant handle any power at all. they sound good but at low power and i mean under 1000 watts shared for both. one p3 in a tuned ported box on 1000 will sound like two 12" subs. i have heard and personally used both get the p3 if you can affored it.
i tend to like the rf's better too. the rfs were made better and yield better sq and spl. i had a vr and the thing blew below the rms. dont like kicker either. rf wins. but on the rf i would try to go 15 inch. heard the 12 and 15 and the 15 is much better in terms of spl.