are you looking for sound quality or spl? with you just thrown out a price, if i had that money i would buy a 12" soundsplinter rlp and a phoenix gold xenon 600.1
This set-up would fall a lil under 400 and it should sound so bad ***, you could always get a CVX, or a Type-r Wich are rated almost the same as the le7 for a lil cheaper, but as kicker states square is louder!!
I dont think so bro, also in what car is this system going on, i think you could get the best out of a 15" without having to make a box bigger than a 4.0 for the subs.