Recommended SET amp and speakers to 20k

I’d get this: https://www.daedalusaudio.com/bundle-muse-lta
if you must spend the full Monty and have a larger room I’d swap in the larger Apollo speakers. Check it out!

There are too many possibilities and variations to list. I would suggest starting by choosing a pair of speakers. Preferably by actual extended opportunity to listen or demo. If that's impossible (damned coronavirus!) then by specs/design/size/WAF. Ex. horns or not horns? Single drivers or xover connected? Full range or limited range? Floorstanders or stand mount?

Once you have a pair (or two or three) of speakers shortlisted then you can look for suitable amps and I'm sure that all the good folks here will be prepared to offer you lots of advise.

One word of caution: listing a price point is very helpful but can also bite you in the a$$. Asking for recommendations "...to 20k" is going to ensure that you will receive (on average) seven recommendations at or about 20k, one for 40k, one for 3k and one for a SS system.

So what's my point? You can easily spend 20k on a set system but you can also spend a lot less or a lot more. The target should be to buy for sound, not for price. I think that you were simply setting an upper limit but I assume that you are open to spending less for a great system?

I have a customer who has Zu Druids and an Art Audio Carissa.  He is super happy with the combo.  Full disclosure, I have no affiliation with Zu but am the importer and re-seller for Art Audio.  

Here is a link to the Zus
https://www.zuaudio.com/loudspeakers/druid-r3jpx

Here is a link to the Art Audio Carissa
https://artaudio.us/products/carissa-se-845-copper-reference-stereo-power-amplifier

With preamp, this would be over your budget.  However, I have a stereo Carissa coming in on trade which I am going to be selling for $4500.  He is upgrading to our Harmony Silver Integra.  I am just about to relaunch our VPS preamp which is a dual-mono preamp that will be available for $4000.  The VPS is such new news I haven't even created the product for sale yet.  

It would come in a bit below your $20K budget at $18,500.  

There are a million other options.  I happen to know this would be a very good combo.  You could probably use the extra $1500 to get a sub to go with the Druids. 

I would be looking at a Charney Audio speaker and an Elekit 300B kit amplifier combination.