I have had the CVX 12's they get loud and have better SQ than there L7 counterparts but the W6's will have much better SQ than the CVX's, but the CVX's will get louder than the W6's......So I would go with the W6's since you have a sealed box, if you did the CVX's I would go ported, hated how mine sounded in a sealed box.
I decided on the 12W6,but i got a call a little while ago from an installer who can make a ported glass box for me. I heard the CVX12's today when i was out and didn't much care for ear bleeders