I owned the bottlehead dac designed by john Swenson for many years.
Had a power supply failure on it a few years ago and sent it in and had a new beefier power supply built by the guys here.
Last year though, it reached end of life for me (skipping, etc) and I had to look around.
The nos dacs interested me and After a lot of research ended up with the holo newest spring 3 kte. I worked with Tim at kitsunehifi. Great to deal with.
Wonderful sounding, built like a tank, beautiful, and highly recommended. You can include their pre module inside the dac so you no longer need a pre.
I am running coincident technology Frankenstein mk3 tube monoblocks and Lii Audio reference speakers, which are transparent and fast, I wanted a natural sounding dac with the system I was building and it all works together well.
John