I'm fairly new here. I am shopping for an amp upgrade (I presently only have a Carvin Probass 150). I have been looking around on Ebay etc. My question is what other amp/cab companies are roughly comparable in price/quality to Carvin in the used market? Look's like I can get a used Redline 4x10 for $200-$300 and a Carvin Head (anywhere from 300-600 watts) for about $200-$300 also. So my total investment on a used setup would be $400-$600 depending on the deal. What other amp/cab makers can I get something similiar and should be looking for? Thanks!!!