I should start with speakers. This I know. I’d like to establish a new system.

Im not going to push any personal faves that are generally highly biased . But may I offer some SYSTEM synergy general decision factors to consider

.Picking your speakers first in isolation without a contemporaneous proper equal consideration to the upstream amplifier options is a high-risk and likely roadway to disappointment. Total system budget allocations matter upfront.

(1) amps vs speakers budget matrix

The philosophy is clear. An affordable speaker with decent amplification (and source) makes more sense than an expensive speaker with a cheap amp and source.

(2) Don’t ignore Amplifier power ratings and your speaker choice impedance curve & speaker efficiency ratings

Another word on amp power: though it’s less of an issue now compared with the days of valve amplification, if your speakers are demanding to drive, you’ll need a suitably muscular amplifier to support them.

Don’t look only at the headline power figure - see what happens when the impedance drops to four ohms. If the number nearly doubles, then your amplifier has good current delivery and will be capable of driving more demanding speakers.

Here is my system :

Wiim Pro Streamer $149

Schiit Yggdrasil+ GS2 DAC $1699

Schiit Freya+ Pre-Amp with 6SN7 Tubes $1049

PS Audio S300 Amp $1999

Harbeth 30.2 XD Speakers $5990

REL T/5X Subwoofer $699

Tom Trager Speaker Stands $1600

Cables $800

About $14k

Similar room to yours. I listen to jazz and rock. Everything in this system is recommended by The Absolute Sound and Stereophile magazines. The WIIM isn't but it's a great product. The DAC is as good or better than their current versions imo but still available from Schiit. This is a soft tube sounding system. I spent a lot of time picking what I believe are the best components available in their price range. TMR has a used pair of Harbeth 40.3 XD with Trager stands for $11,500 right now which would keep you around $20k.

Hello @toontrader , So many ideas and options!  I am  not into BBC or horns or panels, but will nonetheless add my thoughts.  I have a big room similar to yours, with high and vaulted ceilings.  After several old pairs, I found the Revel Studio and Salon 2 speakers.  I first bought the Studio 2's, but needed more pressure for the big room.  I traded up to the bigger and taller Salon 2's and they fill the room wonderfully.  Great bass and smooth treble.  They can still be found used for around 9-12k, and have held their price for years.  For amps I would buy the best Audionet amps you can afford, if not perhaps the Coda S5.5.  The Audionet amps bring speakers to life, with resolution and sparkle without fatigue.  The Max amps are the sweet value spot, with a used pair maybe for around 16k, but well worth it.  If you can find a pair of the Salon 2's, you can likely use them forever or a year or two and sell them for near what you paid.  Come for a visit in Mayland if you like!