Speaker recommendations 10 to 30k and no beryllium

Vandersteen Quattro Wood CT. Hard to top even though cost of pair will land in the bottom half of your range. Dynamic, lifelike sound with excellent imaging.

In that price range - there is little, if any, that can match the sound of the Legacy Audio Aeris - the Focus SE's are close (both with AMT tweeters).

The only ones that might be better are those from GT Audio Works - superb (planar drivers and ribbon tweeters). 

Few speakers at any price can match these.

  

You can't go wrong with ATC speakers.ATC SCM50 Passive, Music Direct
ATC SCM ASLT Active, Music Direct
or used at Reverb ATC SCM50 ASL Powered Studio Speakers in Rare Finish | Reverb

+1 for Joseph Audio Perspective2.  Show after show, JAudio has the most lifelike sound without edginess..  I'd just listen to some average recordings to make sure those also sound good.

B&W 800D3. 12 inch woofers with diamond tweeters (with protective screens). I've never heard the Joseph Audio's but people RAVE about them. Lastly, Volti Audio horn speakers -Like Klipsch but built by fanatics.
Let us know what you go with...