Even if one uses the sub 75/25 music/movies and if weight, size, cost ($400) WAF are not an issue then wouldn't it be a no brainer to just go with a PC/PB since one can plug the PB for music if (only if) one finds it makes enough difference? From all the measurements I have seen so far the SB only beats the PB by 1 to 2 dB in the range between around 35 to 80 Hz and no one had said the sealed PB would sound as taut/tight as a real sealed sub.
As you know it was a tough decsion for me too but in my case I had concern with the PB/PC's the weight (PB) and size, otherwise it would have been PB or PC right from start. Thanks for you help from the other thread but still would like your response to my specific question above.