ok here it is . comes down to these two amps. I want good clean bass, and simple good sounding system that will be reliable and not kill the electrical on my car(92 protégé) will be running one type r sub rated at 600w rms. both amps are in my area , both are $100. mrpm850 , al little bit old now. and mrpm500, still has receipt from audio store. what do you guys think?