you can get the hd3s for 380 shipped, and for that price and for the amount of power your going to give it, AND its a sql sub, its a good a ss sql sub if I must say. So stick with the hd3 if you got the room to give them (box) and I would recommend doing 1 amp. Maybe a kicker 2500, RF 3000, memphis 4000, or a hifonics xxx. Or maybe even two ednine.1's. But I would stick to one amp so that you know both subs are getting equal power.