Thanks for the feedback. In my current room the 20.'7's sit approx 7 feet into the room. To address the leanness in the bass I recently added two REL R-328 subs and this has been a significant improvement overall. The Maggies have always been superb on accoustic music, female voice, jazz, and large scale orchestral, but not so great on classic rock 'n roll. Adding the subs fixed that! I have the REL's set on the lowest crossover point and about 1/4 on the volume. Now I can actually 'feel' the bass and midbass enery pressurize the room with music that has strong bass lines; not 'boomy' or muddy, just energy that is there and makes the entire presentation sound and feel more real.
Adding the subs has also expanded the soundfiled noticeably. There is more 'there' there in the space behind the speakers, greater density and I am actually heaing more detail in the soundfield than before.
I don't want to loose these improvements in my new room by going too large. I am leaning towards something around 19w x 29L x 10h.