Why not do 1 15" L7 or 2 12" L7s or possibly 2 10" L7's? Can get them cheap on ebay.
Sorry i must have missed it. But ya i agree with you. i used to have 2 12" L7's in a small sealed box and it wanged like no other, with 900watts to each.i think with that power, 2 15" L7's would be way better than any kind of L5 configuration.
i also think the cvrs will hit alot cleaner then the L7'S