I was hesitant to post anything as I saw it when zero replies was made, but in 5 days has gone up to 3 pages. My initial hesitation was "why the Gr Research forum?" It seems out of context with what you are looking for with most designs ported.
What I hesitated to post...With your lamenting the loss of the Advents, within that era there were basically 4 'affordable' brands in acoustic designs. Advent, AR, Gemini, and EPI. The latter two are still available, with some updating, through Human Speakers.
