I have the following equipment: Denon3802, M80's and VP150 in the front, an Infinity 100 watt sub, and QS8's on the side. This amplifier can push 7 speakers plus the subwoofer. I would like to add the two back channel speakers. The room is about 23x20 with a vaulted ceiling. I have a spare set of Infinity Minuette speakers, but feel they are probably not enough. Within the Axiom line up, what do folks suggest?