Seeking Advice on NOS DAC


Looking to purchase an NOS DAC, budget is $1500.
Currently available for sale are:

- Metrum Acoustics Hex digital converter  (used)
- Metrum Acoustics Amethyst DAC       (new)
- Acoustic Plan Digimaster Tube DAC     (used)
This is a German-built NOS, 24-bit R-2R resistor ladder network, PCM1704U-K converter with 4 tube EC 86 triode outputs.
- HOLO Audio Spring DAC – LEVEL 2    (new, but over my budget of $1500)

My primary listening is via the PS Audio PWT, while music files on my Mac are steadily increasing. I’m thinking NOS due to my large collection of Redbook CD's.

So, any experience or comments on which way to proceed is appreciated.

128x128lowrider57
That’s right George, Redbook is my priority. And I don’t wish to convert PCM to DSD. But the NOS DACs Ive been looking at will play 24/96 or 24/192 downloads from my hard drive thru USB. I know, I know it’s possible they won’t sound any different than 16/44.1.

Computer audio is secondary to me, but I’ve been adding music to my library. And some downloads are misrepresented as hirez, but I'd like to explore this new to me music.
That’s right George, Redbook is my priority. And I don’t wish to convert PCM to DSD.
Ok, look for dacs and cdp's that use the last commercial R2R Multibit from this list the Burr Brown "PCM1704"  (big so let it load and close popups)
http://vasiltech.narod.ru/CD-Player-DAC-Transport.htm

Or you can go discrete R2R.

Cheers George 
@jond, he didn't reply and the ad ended. I emailed the store and it's still for sale, so we will speak via phone call.
Jim