W7's are sound quantity over sound quality subs. They are also have massive basket and magnet structures, need as very large box, and weigh a ton. If you are all about being heard a mile away, and pissing off people by blasting bass (IE being a moron) then get a W7 and a JL 1000/1. Else wise I would suggest....
A single 10 or 12 W3v2 is more then enough when setup in a proper box, ported correctly.