I have yet to hear a mutli-channel (3,5,7) HT amp sound as good as a comparable stereo or mono amp for music/stereo listening. I have owned a few multi-channel amps, in fact some of the more highly acclaimed ones. Theta Dreadnaught II, Krell, Conrad Johnson, . . .
While I don't blame you for starting with this approach, I think in the end you will find that the multi-channel amps cannot compete with the same brands two channel amp at the same power rating/comparable series level. I can tell you that some of the multi-channel amps I have owned were down right disappointing in 2-channel performance.
As to the quality of the phono section in a preamp, this is going to vary widely by mode/brand of preamp. Personally, I think you are better off finding the best line stage for your budget and adding the external phono amp. Insisting on including the phono section into the preamp will knock out a lot of really good line stages.
In the end, I suspect if you 2-channel is really important that you will end up with a good preamp, 2-channel (or mono) amp(s), etc. . .
FWIW, I wouldn't bother replacing the NAD with another pre/pro unless there are popular (movie) formats the NAD cannot process.
While I don't blame you for starting with this approach, I think in the end you will find that the multi-channel amps cannot compete with the same brands two channel amp at the same power rating/comparable series level. I can tell you that some of the multi-channel amps I have owned were down right disappointing in 2-channel performance.
As to the quality of the phono section in a preamp, this is going to vary widely by mode/brand of preamp. Personally, I think you are better off finding the best line stage for your budget and adding the external phono amp. Insisting on including the phono section into the preamp will knock out a lot of really good line stages.
In the end, I suspect if you 2-channel is really important that you will end up with a good preamp, 2-channel (or mono) amp(s), etc. . .
FWIW, I wouldn't bother replacing the NAD with another pre/pro unless there are popular (movie) formats the NAD cannot process.