Ok guys, I need help choosing the right setup. Here is some up front info. I already have a 4 ohm, Ampeg SVT-410HLN (500w RMS/1000w Peak). In the future I am planning on either adding a 1x15, 2x10, or 2x12 extension cab. However in the mean time I have this Ampeg cab that the power amp will be running. I already have a preamp laying around so that is not an issue either. So I need a power amp that can run this Ampeg cab for now and then I can go stereo once the second cab is purchased down the road. Lets assume the second cab will be able to handle similar loads to the Ampeg for simplicity sake. So what are your recommendations? QSC? Crown?