The OP states in the post above that the depth of the PB-2000 won't work for him.
The VTF-3 mk5 and Monolith THX 12" will unquestionably outperform the LVX12. Their drivers are on a whole other level. Keep in mind that all of these subs have fabric grilles, by the way. You might consider the
Outlaw Audio Ultra-X12, it is an excellent performer, and there is nothing for a cat to scratch on it. No fabric anywhere, and no vulnerable foam surround since the sub is down-firing.