Can we please make this a sticky!!!!! Or at least mandatory reading for this section...
http://www.rockfordfosgate.com/rftech/wiringwizard.asp
To answer your question. You need at least 600 watts at either 1 or 4 ohms. If you show the amp a 4 ohm load you have abot 7454785 different choices of 2 channel amps that will do the job. Likewise, if you show the amp a 1 ohm load you have 5421 different choices of 1 ohm stable mono amps to choose from. This is aside from MANY other amps that can pull double duty and run both your subs and other speakers in you car. So, in total you have right around 3254978556 different choices here bro. Sorry to be such a smart ass....but DO YOUR HOMEWORK FIRST, ASK QUESTIONS NEXT!!!!!!!!!!!!!!!
Oh, and good luck