Which amp should i go with. I need a 4 Ch amp to power a set of Hertz HSK-165.4 components in passive. The rear two channels will be bridged to power a Memphis 15-SC12 shallow sub. From what i've seen online the MB Quartz is under rated at 125x4 and the Planet Audio is overated at 140x4. They will both be around $150 to the door. Or is there something else i should be looking at. Thanks.