So, I began this thread, and feel compelled to offer a brief update on my thought process thus far. Incidentally, I truly appreciate all the good feedback folks have provided; it's a little troubling to make a purchase without personal listening experience, but that's kind of the reality of things for me (and perhaps others) right now. Still, there is a lot of "research" that one can do in hopes of providing some guidance (although finding consensus is entirely another matter).
First, I'm generally a tube guy - which has tended to work well with my horn loudspeakers. For this reason, I've found the Tubador, MHDT, Black Ice (Jolida) and Border Patrol DACs to be most interesting. However, they all lack balanced outputs - which I would like. (At an added cost, these can be had on the Tubador and MHDT models). Upgraded tubes, if required, are yet another expense to consider.
Among the non-tube alternatives, the Denafrips Ares II and Pontus (the latter is outside my current price range) seem to be among the most "analog" sounding non-tube DACs. Since both my primary and dedicated headphone amps are both SETs, I figure these will probably sound OK in my system (indeed, the added virtues of "layering" harmonic distortion is intriguing).
For me, one attraction of the Ares II is price. At ~$775 (USD) for a brand new warranted unit, it packs a lot of risk-free performance into a relatively small package. The fact that there are currently far more audio ads seeking than selling Denafrips DACs also suggests it might be fairly easy to upgrade to the Pontus at some future point. (Yes, I know. We're a notoriously fickle lot - and this could easily change overnight).
I would add the RME ADI-2 into this same group offering > "bang for the buck." However, it just has a lot of features I'd not likely use - and I don't need the pre- or headphone amp function. Otherwise, this unit would be further near the top of my non-tube DAC list.
It all continues to be a learning experience. All in all, the number of fairly affordable, high quality DACs now available is a not a bad "problem" to have.
Terry