i'd like to make sure that whatever speakers i choose are properly powered. how dangerous is it giving speakers more than their RMS? i would like to give the L/C/R channels 250 - 300 watts because most of my speaker choices are in that range and give the suuround sides and rears 125 - 150 watts. my ideal setup would be a 3 channel and a 4 channel, but most companies only make 2 channels or 5 channels. is it worse to underpower the center channel or over power the rear channels?