I am very sorry, I mistaken Aquarius with Aqua that cost >10k. Will edit this post.
It is nice that you read this thread. You may noticed that I reposted it from that thread.
Now you know that I am not only person who favour Audio GD products.
As for Holo Audio, these DACs are directly comparable with Delta-Sigma DACs. It is because of digital filtering and noise shaping deployed, it makes sound is more similar. It is interesting that no reviewer make direct comparison with R2R DACS which have no questionable NOS mode. Remember this comment, it is important.