I have never heard of QSC amps untill this forum. Now QSC has my interest. I have tried contacting a QSC sales rep in my area but so far no reply back. I am asking the QSC experienced here at TB to help out by giving me a "ballpark" idea of what the cost would be for RMX850 and RMX1450. Also, I have a SansAmp (pedal model not rack)...would that work well enough as the preamp with the QSC amp?