The guys are bang on with there assesment
your total cubic volume of the area is slightly less than 6500 cubic feet - I would recommend the use of dual subwoofers within the area - dual EP350's would be a good choice
it is unlikely that you will hear any difference to performance by bi-wiring - bi-amping should be passed
select the M2/M22 in-wall for your surrounds if the QS series cannot be used - you could also utilize the M2 as a ceiling speaker
there would be no worries utilizing the Denon to drive the system, the Emotiva would add power, always a good thing
call the toll free number, 1.866.244.8796 should you want to discuss your options further.
