I'm narrowed down to this:
(2) QSC K8.2 with a QSC KS112 12" Sub
(2) RCF HD10a MK3 with a RCF 708 AS II 18" Sub
(2) RCF HD32a MK3 and wait a while to pair up a sub..the only logical choice being the damn expensive RCF SUB 8003-AS 2200 watt 18"
All three options are about $2,000 right now.
Ouch. Ended up at $4,000.