I have had RLP 15 Sealed and Ported, SI Mag 12 ported and 15 sealed. Now I have the DD 9512G. I think I am getting too old to hit 145 with single 12 in the trunk. I am wanting to go to 2 sealed RLP 12's in about 2.5 or 3 Rli 10's in about 2.2. I have 2000 watts to spare and I want great SQ with mean kick drum on Metal, but also the ability to get loud. Is this gonna do it? Am I better off wit 2 12's ported at 1.6 cubes each for just a little bigger box? I just want it crisp and loud if possible.

The two ported 12's will have the edge in output, but sealed 12's or 10's sharing 2000 watts in your proposed enclosures are no doubt going to provide more than ample "crisp and loud" bass reproduction even if you won't be setting any SPL records.