Best speakers for max. $3000?

As far as new speakers go, the best I've heard under $3K, that I believe most listeners will enjoy are the Spatial Audio M4 Triode Masters, recently replaced by the M5 Sapphires. They do require a fair bit of distance from the wall behind them but are not finicky otherwise. Spatial's customer support is excellent as well. 

There are other speakers I prefer that can be had for less than $3K or near $3K but I don't consider them as good of all-rounders. 

From what I’ve read about them nothing new at $3k is going to be much of an upgrade.

Here’s an apparently level headed review from Doug Schneider:

http://www.soundstagenetwork.com/revequip/mirage_om7.htm

So you’re best looking at used, and even then there’s nothing obvious to report. At this point real full bandwidth upgrades start getting costly. Harbeth M40s, big Tannoys or DeVore models, Wilson’s, and yes the Thiel 2.4s may also be an upgrade if this review is anything to go by. 

https://6moons.com/audioreviews/thiel/2.4_2.html

It looks like you’ve done your homework. Hopefully you can pick them at a good price after arranging for a home demo first.

Check out this Vandersteen!
https://www.vandersteen.com/products/model-2ce-signature-ii