I've got an Ampeg B5R that I love (except the overdrive and octave which is kind of crappy, but I never use it anyway). The tone is great, but the problem is that I'm running it through a cab that I believe has a lower wattage rating. I'll be honest, I know little about wattage and most amp stuff, but I'm trying to learn. The B5R is supposed to be a 500 watt head. I'm using a Fender Bassman 410 that shows 300 watts on the back. It would seem like I should upgrade, but I need some advice. what is the best cab used under $200 for my head? GC has a used Ashdown rated at 600w for $199, but I'm not really familiar with that brand. Or is it possible to split the difference with a second 300w cab?