You have a great system. The weak links IMO are the Furman and NDX v1. Furman is good, not elite. The DAC streamer is a little old so that will eventually need to be replaced.
For Power, I would look at the Inakustik AC 3500P. It is very airy and open and one I highly recommend. With the recommended Power Cord it is like $7K but it is excellent. At a lower price, I find Puritan PSM 156 is airy and open and is $3300 with better power cord. Just not quite as good as the Inakustik.
For DACs, the Naim is nice but I feel is sort of a weak link compared to the rest of your equipment which is higher end. You could certainly look at the NDX2 which is MUCH better with the external power supply. The NDX 2 is $7K I think and the power supply is $6K.
Alternatively, you could look at some DAC server combos. Bricasti or Weiss with with a separate server would likely deliver a big boost to perforamance. They are both pro companies that happen to make consumer products and that show up in the sound.
Something like an M1 SE with Network card ($11K) or Weiss 501 ($9K) and Antipodes S40 ($5K) or K40($9K) would be pricier but would deliver a big, open stereo image. These would be more in-line with the balance of your system in terms of quality.
In fairness, I am a dealer for all of these proucts so I am biased but I am far from the only person you can buy them from so there is that.