I agree with gonk's advice on this subject. I added an ATI 2chan amp to my existing 750 amp and it works fine. But if I had not already had the 750, I would really consider getting the 770 to make things a little easier by have one amp for everything.

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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