I ran the HD 750/1 to a 10w7 in my MS3 and it was about the minimum I'd ever run to that sub. It really didn't have the punch I've heard out of that sub in other vehicles. I ending up putting the sub in JL's ported ProWedge box because it needed an extra kick.
I think the 500/1 would dissappoint a lot of people with the 10w7.
Displacement makes you complacent