What are you really looking for from your system? What are you trying to get besides just a bigger watt rating from your amplifier? Maybe I've failed to address these questions with you, because when I talked to you about the P900.4 I didn't really consider that you may already have a good amplifier. 90W per channel is miles better than head unit power, and while more power is good, you eventually run into some major limitations. These limitations include overpowering your speakers, which leads to power compression and overheating, exceeding the mechanical limits of the speakers, and needlessly drawing more current from your charging system.