I have heard the TOTL Yamaha amp and preamp with the NS5000. It was not the gear I would use with those speakers. I actually own the NS5000 and use a CODA #16 with a Holo Audio Serene preamp. My Schitt Yggi+ OG DAC is also much better than the expensive DAC I heard paired with the TOTL Yamaha gear.
I recently heard another amp that I would love with the NS5000, it was the neutral SimAudio 761 from the North Collection. Different sonically from the CODA and the Yamaha gear.
I thought my setup sounded excellent, but I only have a certain frame of reference. However, when a friend of mine, who is a musician and audio hardware vendor for some seriously famous musicians came over and heard my setup. His comments were very informative and made me realize I should keep the NS5000 forever. I tossed out the shipping boxes.
@deep_333 thanks for the heads up on the Aavik SD-880 and the 880 amps. I find your posts very informative.