By the end of X-mas vacation ill have about 600 dollars to spend on subs, amps, and boxes. I wanted to get at least 2 12" or 2 15", or what evers louder. I want a loud system, i was thinkin about alpine or JL but don't know what is good. Can anyone tell me the prices, where to find them, and what would be the loudest. I dont know if i should get sealed or ported box, which is louder. I want a mix of loudness and quality, and if possible an amp that is 1 ohm stable.