Alright I'm down to these two subs orion hcca series and Aq hdca series both will 12 in I've heard both and if I remember correctly the orions were louder and hit harder wit better sq but I figured ill hear some thoughts
If you have the cash and the power for the HCCA get that. Make sure you put at least 2000rms to it. You would deff. need some electrical upgrades then.
Audioque is an awesome company. The HDC3 will get very loud and still have some SQ.