When I purchased the Anthem MRX720 I chose that instead of the AVM 60 solely because I wanted a Zone 2 for my backyard speakers and I already had a Parasound 5 channel amp. I did want the better AVM60 but it did not offer that option.
If I were you, I would try the 740 on its own, then if you want a bit more, hook up your external amp. I love my surround system with the 720/parasound amp. I am also looking to add an integrated amp to this system but hopefully can find one that is one or possibly two ticks better than the Anthem str preamp. Not easy, but still looking.
But as for surround sound, I love it as is.
Forgot to mention I added an Anthem str amp for the L and R speakers.
If I were you, I would try the 740 on its own, then if you want a bit more, hook up your external amp. I love my surround system with the 720/parasound amp. I am also looking to add an integrated amp to this system but hopefully can find one that is one or possibly two ticks better than the Anthem str preamp. Not easy, but still looking.
But as for surround sound, I love it as is.
Forgot to mention I added an Anthem str amp for the L and R speakers.