Alright, I finally have decided that I am only going to consider four subwoofers:

Axiom EP350
SVS PB-12-isd
HSU STF-3
Outlaw Audio LFM-1

All these would have a final price shipped around $650. Spec wise pretty similar subs all 12 inchers. What are your experiences with these subs and for $650 which sub would be the clear winner of the four. I just need to end my misery of deciding on a sub. Buying the M60's, VP150, and QS8 was not this hard in deciding.