Just to update - I did get a pointer to someone in the Raleigh area with a set of NX-Oticas and subs, and had a great demo and fun listening! (Thanks again, Steve.) I don't have quite the space for the full Otica + subs required so I did end up going a different direction with a full range tower, PS Audio FR30s I found on USAM. Still working on getting them positioned and so on. It's not out of the question that I'll "circle" back to GRR or open baffles again, though!