I have a rockford fosgate 1001bd amp (1000 x 1 at 2 ohms) and am going to buy subs. I have enought room to run 2 12's is a large ported box but am not sure what the loudest 12's are that i can use. I could also use a single 15 or maybe even 18 if that would be louder. What are some good subs that will work good with around 500 watts to each or 1000 watts to one. I want mostly spl but would also like a decent sound. I was thinking along the lines of a single 15" dual 1 ohm X.X.X or the 18" X.X.X dual 1 ohm sub. Would 1000 watts for these be enought? Thanks for the help.