If by Ah you mean me, what do you want me to say? lol Those are nice subs, basically the same as the infamous Sunfires (TC) that have a huge fan base in the home audio world.
As far as the enclosure, Im too lazy to reread the whole thread... is the enclosure going to up-fire into the bottom of the back seat? Ive never been a big fan of that type of install, because you are basically firing your speakers into a giant foam cushion, which will absorb sound to decrease output, and alter perceived frequency response. I do however realize that car audio is all about compromises, so if it must be that way, it must. Just putting that out there so you realize.