Good recommendations.
I need to do more measurements with my setup, but room gain has a lot to do with what you can achieve below 25hz. After showing my graphs to people, not a whole lot I can do with the BFD to make things nicer.
When I measure next, I will do 1/6th octave as oppose to 1/24th octave, people seem to think I will get a pretty smooth graph that way.
In comparing subs, there is really more to the sound than all the measurements that seem to be available. I know what I have heard and it is very good learning experience.
My choice? VTF-3MK2 without BFD for now...especially if you are going to be more HT than music(although we know that changes with Ascends) Get a BFD later, or another EQ device that is on the horizon.
You can also try b-stock.