Im new to this preamp and power amp game, having always just used a head unit for all. Ive done the searches and think I have it down to these three. The QSC RMX1450 or 850 and the Crown CE 1000. Im gonna be building this rig using a Tech 21 RBI pre. Ive heard a few bad things about the Crown, stating it cant handle much stress and clips. As far as the QCSs are concerned, is the 850 enough power to play in a live setting or do I need to opt for the 1450? Man, Im lost. For now, Im pushing a Carvin 1-15 and 2-10 cabinets. I may change later, but that what Im using and will be for a while. Thanks for any input.