I appreciate Sounds_Real's enthusaism for C&C speakers, but if Tvad is truly looking for "Speakers - Down to 30Hz", I'm not sure the Abby/Bailey combo is going to deliver that performance with sufficient SPL's.
Tvad's room and mine are almost exactly the same dimensions. I have the much larger C&C IM-Bens with two passive Balieys driven by an IcePower 500ASP module in mono and in my room it's -4/-6dB at 30Hz.
Granted my room is; a) untreated, b) accoustically insane with the room looking down onto the living room below. So, I am not getting all the room reinforcement possible.
But, I would be hard pressed to believe he is going to the kind of low frequency output he seems to desire with the Abby/Bailey combo.
One thing I will agree with you on is the tonality that can be had from the combo. It sounds very, very, good. Shockingly so, if you like high(ish) efficiency fullrange-driver speaks.
30Hz, "Reasonably small footprint", and "fully driven without compromise by tube amplification with as little as 15wpc" is a very, very, difficult demand.
So, it all comes down to which tradeoffs a person is willing to make, especially in the $3,000 or less range.