Speaker recommendations welcomed

Your room is pretty massive.  I don't think a lot of these recommendations are really going to fill out a room like that.  Big room, need big speakers, simple physics

In my similarly sized room, I love my tekton double impacts.  Yes they have seven tweeters, but mostly they are for the mid range which is blissfully smooth and accurate.  The high end is ultra smooth and relaxed.  But if you're a bass head at all, you'll want subs with whatever you choose in that large of a room.  Unless you get lucky with the gods of nulls and room peaks and wind up with decently even output down to 30 hz.

Could also go Tekton Nebo if you want to try the larger array.  Both of these speakers are well under your budget and will outperform similarly priced speakers in a larger room typically.  Check out this review

https://www.stereotimes.com/post/tekton-designs-double-impact-loudspeakers/

I guess for $5k, this is the best floorstander you could get in terms of value. TAS, in particular, did a fantastic job of describing its sound character.  But, you probably need to invest multiple times that amount in electronics to unlock its full potential.

https://www.youtube.com/watch?v=DeL7DvkbHgE

https://www.stereophile.com/content/svs-ultra-evolution-pinnacle-loudspeaker-measurements

Check out Audio Physic, a lesser known speaker from Europe. I have enjoyed them for the last 7 years.

I am partial to ATC as I own one. ATC are very precise and presents music as how it was recorded. with the correct power amp. it will sing. as you have stated you want front standers. the ATS scm 40 will do the job. NOW, another option is to go active rather than going separates (since you do not have an amp as of now) consider going active on the atc,  

If budget is limited, then another speaker i will recommend is the Maggie LRS +

and just supplement it with a subwoofer by REL. this combination i used to own and is very satisfying, provided your give it a 1) a large enough room 2) very good amplification,

Electronics: Really considering Michi P5 S2 and S5 amplifier for electronics, some sort of streamer as yet to be determined. I also like Coda and Pass Labs.

@hk_fan The CODA is my preference over the Mich P5 and any PASS (a bit too warm for me). The CODA #16 is great (own it), and the CODA #8 is very good (owned it). However, for $2k the Schitt Woton (own it) is a contender with the #8. I would take the Wotan over the Mich. The Woton needs a lot of break in.

Your room is a great size. Add a bit more to your speaker budget and get something you want to keep for a long time.

To save some more money get a used Sonore OpticalRendu streamer. You can get one for about $800. I have 3 of the older models and they do the job very nicely. When one of my 3 streamers die, I will look at the new $5k Lumin U2 streamer.

Lowering the price of the amp and streamer gives you more speaker $$ to work with.