I'm assuming you have a fairly standard room (11,000 cubic feet or less). Three things to consider:
1. The QS8s mounted up "high" will give you more of a theatre-like experience due to their design and location.
2. The rear M80s can be run over the entire frequency range but that may lead to bass issues (cancellations and re-enforcements). Many believe that it's best to let the sub mange the bass.
3. Your receiver may not be able to drive M80s in the front and sides.
Buy QS8s and save your money for an A1400.
