Actually you don't absolutely NEED two amps. You can get the JL audio e6450 (now a6450) for about 300+ shipping on EBAY or infinity also has a six channel amp. Both of those would power your full system. However, I'd do two amps and definitely a mono block for the subs as neither of those would give you enough power for your subs. I agree with the at least 500 rms comment also.