Ok i see theres two JL subs. That doesnt tell me much. Go with W3's or higher. My friend got the new 12W7 and it's just insane. I dont think you'd want that so the W3's are your best bet. You didnt specify anything else though... no amp? no HU? or you have that already?
And it's nice, but not for show. Perhaps you should cover the enclosure in fiberglass or vinyl. Let me know.