We've acquired a decent PA but it is missing the power amp. I'm thinking we may need something along the lines of 2000+ watts. I'm planning on running kick drum, maybe all drums and vocals. This power amp has to be able to over power two or more Marshall full stacks. I'm seeing some decent priced stuff like Gemini DJ power amps for a couple hundred bucks. Are these going to work for what I need as a live PA or do I need to go with something else like Crown which would be triple the price? Is there a difference between a DJ power amp and a regular one...? I know a little about everything but running live sound other than guitar or bass is where I'm the least experienced.