@fosolitude,
You have a terrific Jota amplifier (And wonderful SOTA turntable front end) to build around. Your 15K budget allows numerous excellent options. Cube Audio Nenuphar is a terrific recommendation given your sonic presentation objectives. Definitely worth an investigation.
There have been consistent positive comments on forums regarding, Charney Audio speakers, Fyne Audio and Viking Acoustic peakers. The choices mentioned available with Avant-garde are intriguing. The Canadian Coherent Audio speakers are very highly regarded and quite easy to drive. Audio Note which you’ve obviously heard in the full AN room at the show.
You truly do have genuinely excellent choices before you.
Charles