You should not have a problem with damaging your surrounds with the 770 unless you listen at very high levels for an extended period. I agree with gonk's views also. I have the 750 and I will be hooking up Paradigm Mini Monitors to them for center surrounds. I will use an ATI 1502 to power my fronts.

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Paradigm Studio 20v5-fronts
Paradigm Studio CC-490v5-center
Paradigm Studio 10v5- side surrounds,Monitor surround 3v7-bck surr
Oppo UDP-205/LG 65C6
Outlaw 976 prepro/ Emotiva BasX A-700 amp
Power Sound Audio 15S