SB, that looks like an excellent system. The 3805 should have no problem driving the M80s. With the 3805 you can equalize the speakers and the BFD can equalize the sub, so you'd have everything covered. One possible change to consider would be M2s for the back surrounds. The QS8s offer plenty of dispersion and the more direct M2s in back may be of benefit.

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Enjoy the music, not the equipment.