OK, here's the deal: I'm getting ready to purchase a power amp, and I was looking at the QSC RMX 1450. I have a Peavey tfx 4x10 cab at 4 ohms, so I figured this would be enough power. But I found a used QSC MX1500a for only $100 more, and this seems to be the high end model for QSC, w/ even more power (1500W if I bridged it...) Does anyone have any thoughts on this? Would it be worth the extra money to go w/ the MX instead of the RMX? I know a lot of people use the RMX--is the MX really for pro audio instead of bass? Help!