Do you have any relation with Ami Creations? Anyways how do you know the aq3500.1 does more than the DC 3500 just want to know? I'd also go with 2 3500s instead.
You'll be fine overpowering 12" xls iirc skittles on here has 2 12"xls on 2 cresendo 3ks. I just bought some 12" xls too and I'm going 1.75ft^3 each sub and throwing an aq3500d.1 at em.