Not that much to be honest. Recently got a job. Dont want to spend a crap ton but for now im gonna get one sub and whatever amp it takes, i know its $150 per sub and i am willing to go maybe, $500 on the amp. Itll take a while to get the money but thats life. I know the mrp m500 is 500rms at 2ohms x1 and sells for $200ish. Cant really think of any other models at the moment. Just give me a cheap and high end cost i guess. And try not to use the PDX amps they have. I know they are possibly better but i dont have THAT much money to work with.