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Hmm, I didn't think about the NFB-10. So it is a fully balanced amp & DAC with single-ended input as well, for $549? I didn't know a fully balanced setup could be had at that price point. That is intriguing.
I mentioned the SA-31 in the context of your question "...are other amps / DACs out there generally warmer than neutral?" and as an option for someone preferring warmer gear. Looking more carefully to your question now, I think you are right.
On the 300$ vs 700$ setups, the price difference is big enough at this level to be virtually certain that the more expensive one will be a step above. Whether it will be modestly or significantly better is I am afraid very personal in this hobby. For what is worth, I had found the Audio gd NFB-10 much better than the Audio gd NFB-15 (NFB-12 at the time) - so I would thought that the NFB-10 should be a better alternative than your (1) or (2).
Hmm, I didn't think about the NFB-10. So it is a fully balanced amp & DAC with single-ended input as well, for $549? I didn't know a fully balanced setup could be had at that price point. That is intriguing.