Do you have recommended crossover points, for each class of speakers, where a room size moves each particular speaker's attributes from the "good to have" column to the "must have" column? Ideally, I guess, this would be a table, with room size on one axis and number of speakers (2.0, 5.1, or 7.1) along the other axis, and the recommended minimum package at each intersection.
Of course, I already own the Epic 80, so to me this is of purely academic interest. :) It is certainly overkill for my 15' x 11' x 9' room, but I expect to move soon and I hope my living room will be larger. And for now, the overkill is actually nice.