I was thinking about using Mission 77DS speakers to complete my 5.1 setup, but I'm having trouble finding a pair. So I thought maybe I'd upgrade my fronts, Mission 772, to maybe the floor standing 773 or 774. If I did this I would use the 772s as rear speakers, where should I place them for the best sound? Is this a good idea or should I wait for the 77DS? Or maybe even buy some M7ds?