Yeah i asked somthing similar to that and the 2 13w6v2's will push more air and give you better quality sound. However you might wanna find out which kinda box whould be better... Sealed or PORTED?????
either would sound good, some people say the W7's have a sound of their own though, so you might wanna listen and see what you think. i have the 13W7 setup in a ported box and i like it. i'd say the W6's would have better SQ, both will be loud. W7's sound great in either ported or sealed (the H.O. boxes are nice if you have the room) but ported gives you some tuning options.