Can anyone recommend a good streamer/DAC?

My amp is a Rogue Audio Sphinx (100 watt per channel class D), and speakers are KEF LS50s. I have a B&W subwoofer. Principal use of the streamer/DAC will be to play high resolution Qobuz content. I don’t need the device to be an amp or pre-amp. Budget: I hope to get something for $1,500 or so but would spend up to perhaps $4,000 for a substantially better product (that is, a more than marginal improvement in sound quality).

+1 to moto's response

OK, that narrows things down a bit by excluding amp devices. So the choice is between separates (streamer + DAC) vs one-box streaming-DACs, over quite a wide budget spread, so still a ton of options!

I might suggest shortlisting just the one-box solutions first on the basis that they can be compared more easily and also because standalone streamers are much fewer in number vs straight DACs. You might read therefore that standalone streamers are best for folks who already have a DAC they like and want to keep, rather than because separates are superior for a given spend. Also, the weak point of separates is you need to ensure high quality USB/SPDIF implementation between the streamer output and the DAC input; another rabbit hole.

Some usual suspects would be Auralic, Mytek, Simaudio. The new Gold Notes also look interesting. I’m reading that you like a clear, neutral sound given you have a hybrid amp + KEFs, so perhaps biasing towards a warmer sounding front-end would make sense. The only way to be sure is to trial components in your system.

I can discuss the Cambridge 851N. I got one in 2016 and have been happy with the sound and reliability. I listened mainly to CDs and flac files ripped from CDs, with the odd hi-res and DSD download. I have a 10TB hard drive attached and it does very well as a streamer, tough the user interface here is a bit primative. The best part, though, is the recent firmware upgrade to include Qobuz. Wow. I couldn’t be happier. Switched from Spotify and now 90% plus of my listening is through Qobuz.
A buddy of mine has the CXN version 1 also with bel canto monoblocks, and the 851N does sound better, IMO. But it didn’t get the Qobuz upgrade I believe.
It would not surprise me though, to see Cambridge introduce a new network/streamer at the $1500 price point. Their new Edge is getting very good reviews, and it is logical to see some trickle down from there. But nothing has been announced to my knowledge.
One further note, the 851N on the used market (~$500) seem very very inexpensive to me...maybe an interim fix if you are waiting for a new product from Cambridge.

I have the Bryston BDA-3, connected a Bryston DAC3, which was an upgrade over Bluesound, which I still own.  Bryston sounds much better with Qobuz (and everything else, for that matter) Played into the Bryston DAC.  The player that you are looking at is a fantastic bargain compared to what I paid, which was purchased before they came out with the combo product.
  The Bryston Manic Moose control software is pretty bad, the Bluesound beats it easily, but if your main source is Qobuz it won’t matter, because you will creat favorites or playlists on another device .  MM then has tabs for that then just pick rom there