I ordered the Ampeg PF-350 with the PF-210HE and was somewhat disappointed with it. Sound, rather, tone-wise I was impressed but I was disappointed by the volume level, it didn't seem that loud even when I was cranking it. The volume may be my false expectations as this is my first bass amp purchase. However, the PF-350 rattles horribly even at low volumes. I secured all screws but after taking the top off the amp head chassis, the rattle was the computer board. When I say low volumes, I mean I am sitting in my office playing bass and my kids are watching TV in the living room. When I unmounted the head, the rattle goes away but that defeats the purpose of the flip top. I returned the head to musicians friend in exchange for the PF-500 hoping the new head would not rattle and also remedying my fear of not having enough juice to power any future cabinet arrangement I may end up with. My short term plan is to add another 210HE to match my two 8 ohm cabinets to the 4 ohm head. So my question is preemptive, in case my PF-500 has the same rattle problem. What is the best amp head in the 500 watt range for a first rig? I would assume tube amps would be out of price range, let's say a $500 max. I am very attracted to the PF series because of the headphone jack and aux in so I can jam along with music from my computer, which is a feature I am loving as we speak while not disturbing my family. Other than that I don't really care for bells and whistles. Any suggestions?