I have the t-series which are the the same speakers as the p series. I have a Punch 500.2 running to them. which is 250w rms @ 2ohms. And the combo's are 2ohm. They sound really good but be careful to keep any bass turned down on them or you will fry them.
Razz is right, its always good to have a little more and turn it down than to have not enough and push it too much and cook them because you didn't have enough clean watts.