There's lots of good subs out there for sure.
I have been quite curious about the Paradigm sub25.
if you like reviews, a few have put it above the JL Audios.
I haven't heard it,but she's suppose to be the one to beat,
except perhaps the sub2.
Of course that could be debatable.I have a 11X15(with Gik traps)and use 2XDD-15s(for music)I like two better than one as
you can sit anywhere and it's a nice layer for the higher
instruments to dance on,nice and solid.
I do want another just for movies as it saves me reconnecting and adjusting the EQ ect.
even in a small room two is better than one as I and many others have discovered.