I am interested in getting an amp for my system. I have a Denon 3802 receiver, B&W 603's, LCR 600, and 601's for the rear surrounds. I dont want to decimate the bank account on this so I have been poking around e-bay. I am considering either a 2 channel or 3 channel amp. What is the general rule of thumb on this? Should all 3 front speakers be powered by the amp? Or is it acceptable to get a 2 channel for the mains and run everything else off of the receiver? Usage is about 70% movies and 30% music. I enjoy listening to music in stereo however the wife likes using all 5 channels (she doesnt use it for music very often though). The room is approx 15x20. I have narrowed it down to basically 2 amps. Either a B&K 125.2/.3 or Rotel RB 1070/1080. Of course I would also consider the B&K reference series if I can get a good price. I think they may be a little overkill for my system though. One last thing. I dont really like music through all 5 channels because I seem to lose some low end. I assume thats because the amp in my receiver cant push all 5 speakers that hard. Would adding any of the amps I mentioned dramatically change that?