If you really want Rockford Fosgate, I would go with the P3, or the T1's..Very good subs...
I dont know how much you want to spend, but those are nice subs for the money. They do make P2's but they only come in single voice coils, which would limit you to amps.
I have two Lighting Audio VC2s, on the Kenwood 811D amp., in a custom ported box. Love it...Just need to get my factory speakers replaced now.