i would keep the box you have now, the new design is too big IMO.
that HDC3 will love the AQ2200D. espically since you have the new design with the new suspension it looks like.
i did get the new basket i wasnt aware they changed anything else is this sub more power hungry? because honestly i feel as if its just laughing at the aq1200 i have played it for an hour solid just slammin it in 95 degree weather and it doesnt even get warm.