Hey guys. I have been out of audio for a little bit and i was hoping you guys could help me with some suggestions on amplifiers. I want to plan out costs and what kind of equipment I am going to get. I want a 4 channel amp anywhere from 75-150Wrms per channel. And I am also looking for a 1000-2000w amplifier for a sub. The catch is these amplifiers have to accept inputs for a differential balanced outputs from my stock receiver. I will not be changing my receiver b/c it is a navigation unit. Thanks for the help.