As the proud owner of Bee-Pre + Paramounts I will throw in a recommendation for Orca's + Dungeness Sub. I have the pleasure of having Orca's, Orca Mini's and a couple of Dungeness's. Having played about with them in a few different combos, my current listening room is 28' by 18', I would say that I have settled on the full size Orca's with a single Dungeness Sub.
To give some indication of how they fill the room I usually find that I leave the 'coarse' volume setting on my BeeQuiet at -27db (notch 3 of 6) or -18db (notch 4 of 6) and it more than fills the room. In fact I often set it to -18db and then can happily potter around in the adjoining rooms with the music at a pleasant level.
And for the record the Mini's with a Dungeness Sub also sound good - but when it comes to decision time I personally choose the full size Orca's + Sub.
Bill
Bill, appreciate your feedback. I found that those same settings of the Beepree worked well for me also. One note for you is that we prefer the sound of the Dungeness Maxes with the Mini's, as the tuning of the Dungeness Max is more congruent with the higher roll off of the Mini's, and they were developed to work together. The Orca Classics/Deluxes go best with the Classic/deluxe Dungeness subs, which were developed at the same time as well. We still love both the Deluxes and Mini's for their respective sets of strengths.
Josh - In my experience, there is the rated efficiency, and then the actual efficiency of any speaker. Most manufacturers like to give you the ratings of their speakers "down hill with the wind at their back," adding assumed factors like room and box gain to their advertised figures because high numbers sell better. We prefer to communicate the rating of just the nude drivers, without any added assistance assumed, even from the stuffing-less enclosures we put them in (except in the case of the thrashers, which do get a little stuffing).
-Clark