Too many choices for R2R DACS--opinions appreciated

I would probably go with the Sonnet Hermes as I'm sure the pricing is very similar between the Hermes and Ambre.  Cees mentioned they both basically sound the same however the Hermes has a slightly larger power supply and uses the Pi4 chip instead of the Pi 3 chip used in the Ambre.  

If you want to use I2s you need to purchase the I2s module which replaces your already installed USB module.  It's very easy to do.  You can't have both I2s and USB connectivity at the same time.

@cooper52 That is an excellent summary of the Sonnet and consistent with my experience of it. I know folks who actually prefer the old Metrum DACs, exactly for that reason -- less resolution, yes, but more fullness to the sound.

The spinner is a huge weak link in revealing what any quality dac can reveal, compared to much newer designs. I, too thought I needed to upgrade to an R2R from my Audio Alchemy DDP-1 + PS 5 dac/pre when using either a Marantz HD-CD 1 or Oppo 105 with ~$500 in aftermarket power supply area upgrades.

The Marantz mechanism died and I replaced it with a Audiolab 6000CDT (MSRP $600). Comparing it to my 105, playing the same disc, but the hybrid layer vs the SACD layer, the 6000 was a very clear winner, so I sold the 105. If you have $3K to spend consider the new Project spinner

hth

Update (yet again): the Morpheus has been doing its thing in my system for about 12 days now, and an interesting thing has happened. Either it has opened up some after quite a few hours of run-time, or my ears and sensibilities have accustomed themselves to the way it presents the sound, or possibly a combination of both. Since it wasn't new when I bought it, I assumed it had been entirely burned in, but maybe not entirely. In any case, I'm really starting to love what I'm hearing now. The slight flatness I was hearing before has resolved itself into smoothness, and I don't find myself pining for the slightly rounder-but-less-precise sound of the AMR DAC that the Morpheus replaced. Had to do a bit of experimentation with inputs, as previously I had been running both the TV sound and my Cambridge Audio disc spinner through a Wyred4Sound Remedy Reclocker which converts everything to 24/96 resolution. It's a big help with TV sound which can only be connected through optical cable, but I found that the disc spinner sounded far more natural and appealing connected directly to the DAC via coax (I'd love to try AES/EBU, but the CA spinner doesn't offer that connection) and playing CDs at their native 16/44.1 resolution. 

So I think the Sonnet Morpheus is going to keep its place in my system for a good long while. Falling in love with it was a slow process, but I'm there now. If I get itchy for further upgrade, I have a pretty good sense of which direction to go, but that won't be soon. 

Thanks again to all for the helpful comments and information.

A thoughtful report, and congrats on having found a DAC that makes you happy!