Thanks to everyone for their input. I do believe the separates route is more-likely the direction I would take, especially since I do not hear any claims that the built-in Aurender DACs are just as good as an outboard $6 to $10k DAC.
On the question of budget:
DAC budget $6k to $10k list
Server/Streamer $3k to 6k list
Server/Streamer/DAC combination $8k to $12k list (I do expect some savings at same quality level if combined since the chassis and labor costs are probably reduced).
It should also be noted that I do believe in room correction. I have good sound attenuation for high/mids, but would ideally like to construct a room EQ to correct for bass modes. I am not sure if Aurender offers this capability, but I feel that such a filter could be constructed within Roon. One of the major attractions of the Weiss DAC (it's reported studio-like accuracy being primary) is the ability to deploy bass-mode correction in the DAC. It also offers a de-essing filter, which I would surely utilize for certain recordings that I otherwise enjoy.
This discussion highlights the fact that listening to these combinations and assessing them is frustratingly difficult unless you have access to a very well-stocked hi-fi store, which are a diminishing resource. Given this is where we are, my plan is to audition the Weiss 502 and new PS Audio DSD when the latter becomes available. From there, I'll make the next choice - Roon super-core (likely a separate PC based on JCAT components), Roon-compatible unit (say Innuos Zenith Mk3), or Aurender N200.
That's unless somebody can say that an Aurender A-series between $8k to $12k list can do both.
I should probably also state that my current DAC "baseline" is the DA2 module in my MC2700 pre-amp. It's actually quite sweet in it's own right, but I have to believe at $2000 list, including dealer installation (if you were upgrading from a DA1) that it is probably not up to the sound quality of the Weiss 502 or new PS Audio DSD. The in-home audition should settle that question, then with a new DAC (or not) in place, I could hopefully audition an Aurender and prove to myself that it is a worthwhile investment.
Which brings me to one final thought (thanks again for everyone's input, and patience with my wandering logic). The Weiss incorporates built-in streaming capability as a Roon Endpoint and I am not sure what this means really. My understanding is that it can operate as a Roon endpoint with nothing but a LAN connection. Does anyone understand how this works and more importantly, how it sounds vs. being fed from a dedicated server/streamer?
Thanks so much for the constructive discussion.
Mark