Earlier this year, I replaced my 33-year old Thiel speakers with a pair of PS Audio Aspen FR10 speakers. (I had also been using an Adcom 555 amp that needed updating/upgrading and has now been replaced by Atma-Sphere Class D GaNFET monoblocks.) I have found the planar-magnetic tweeters and midrange drivers in the FR10s to present incredibly transparent mids and highs without any harshness or listening fatigue. The low end is also amazing, with two small front-mounted woofers combined with three rear-mounted passive radiators. I have not been tempted to add any subwoofers because the bass has been so tight and solid. (Take a look at the TAS review on YouTube for the comments of a drummer who also doesn't feel a need for added subs with the FR10s.)
You can get a new pair of FR10s for $6K from PS Audio if you also have $4K of audio gear to trade-in. (The nominal trade-in value of your old gear is based on the original retail price for that gear, not on the current value as a used component.)
PS Audio allows for a 30-day home trial. If you decide to return the speakers after a trial, you have to pay shipping costs but no re-stocking fee. If you happen to be in the Denver area, you can stop by PS Audio in Boulder, CO, for a listen. I would think you could call them ahead of time to be sure you could listen to the FR10s when you arrive.
Good luck with your speaker search!

