Hey I reccomend Audioque all the way
Ive owned several Digital Designs and Kicker Setups (DD and Kicker are both local companies)
Their HD line is what im pushin now (only a one sub setup) and its amazing. I know they arnt very popular but Audioques owner (DJL on this thread) Is the father of the guy that owns Digital Designs. The whole family is very very very accomidating and knowladgeable. They will help with box design and everything. The HD line that audioque makes is basically identicle to the performance of a DD 9500 but a ton cheaper. (dont think its a 9500 with a different sticker because the motor design is alot different) In fact depending on where you live they will manufacture ur sub in the Digital Designs warehouse. Oh and remember that father knows best.
listen to be bro ive had RE, DD, Kicker... but AQ is where its at homie haha
just tryin to steer ya in the right direction