Hi, thank you all for your help and opinions. I'll clarify a few more things. The ratio of watching movies and listening to music is 60:40. I currently have a Canton Chrono 509 set for speakers, I'll probably change to a Canton Vento set soon. When I watch a movie, it will drive the AVR and integr. amplifier only as a power amp (preamp of int. amp. will be off). If I listen to music, the AVR will be off completly, only the int amplifier will be on + dac and streamer or perhaps a gramophone.
Unfortunately, it will probably not be possible to connect a subwoofer for movies and for listening to music.
I am sending a diagram of how I should have it wired. The question is, does it make sense, or isn't it better to buy an AVR for about 2-3 thousand USD and simplify the whole system.
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Music setup
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Movie setup
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I have to agree with TLS, if you keep things simple, everything will sound better to you once you get used to the new gear.
There is not advantage to have the PM8006 at all, can't even think of one except if you thing it looks pretty. It offers less power output than a mid range AVR such as the Cinema 50, or Denon AVR-X3800H and those AVRs offer the ability to use Direct Live if you think it works better than Audyssey.
I can tell you for sure that if run room correction offered by either properly, the improves in sound quality will be infinitely more audible than that between the AVR and the integrated amp.
The AVR-X3800H is literally cheap right now, considering the rich feature set, and if you are in Europe or better still in Asia, then the Cinema 50 may be a better choice as over there you don't have pay the ridiculous prices for the Marantz.
So my suggestion, is sell the integrated amp, if you feel more power output is needed, and you probably do depending on which Canton tower you are upgrading to, buy one of those Hypex, Purifi based power amp, or even a chip based class D amp. Any of those will beat most Marantz class AB amps by a mile in terms of distortions, though some people may like to hear distortions but in that case one has to look to other class AB amps because Marantz class AB amps are still going to be transparent, without only the warm sound imagined by people under the influence.
Lastly, the Topping DAC, when used with the Cinema 50 or AVR-X3800H in direct or pure direct mode, you may hear improved sound quality though if you do it will be subtle unless you really have golden ears.