I'm going to put forward what I know. Have had virtually insatiable bass lust ever since being exposed to my first subwoofer decades ago.
Go MONTANA -- the higher up the chain you go, the more capability is there obviously. Pair them with Plinius amps and you are there.
I had to retire my dual 18" sub enclosures, because they now serve no purpose. The MONTANA/PLINIUS combination will astound you -- providing room-moving articulate fast and deep deep bass so profound that subwoofers are almost unthinkable. Since I had the subs before I got the Plinius amps, I kept trying to use them, but just stopped turning them on eventually. Now they are permanently retired.