P3's are meh. I guess not bad for 130/pc. but you could get a Type R (as stated above) for around the same money. Or a used Sundown SA which is another 600 rms sub (the SA 10's are on sale for 149.99 at carstereogiant.com). Or the C2 Threatcon for 99 bucks. There's a ton of options that would be better than the p3. Some questions that need to be answered are space you have available, power you're going to run, budget, goals for the system (sq, spl), what your electrical is like, etc.