Wow, what a great thread. Thank you for the responses everyone.
Based on what I have read, the Innuos Pulsar and Sonore Signature Rendu SE Optical remain strong choices in the $5-8K range, along with the Auralic Aries G2.2. One drawback with the Pulsar and Sig Rendu SE is that they tie me to using USB, unless I add another box. Cost effective options less than $3K include the Lumin U2 mini with upgraded outboard LPS or the opticalRendu with an improved outboard PS.
Thank you to @joc3021 for the additional information about how easy it is to switch the Innuos Pulsar between their Sense app and Roon. That was helpful.
To those recommending the Grimm MU1, it is within my budget and I have read the reviews but as good as it probably sounds, I really want to have the server separated from the streamer/endpoint for the SQ reasons mentioned by @dmiller01, as well as for the ability to repair/replace the server if necessary without affecting the streamer. Finally, I like the idea of sticking with products from a company that is established and experienced with servers/streamers as I suspect the support will be more reliable like it was when I used the Antipodes DX3.