Speaker suggestions at around $30k

Verity Amadis. Reason - meets all of your criteria.

New or used?

Of the ones I've heard, Focal Utopia line speakers match your criteria best.

For a similar sound for perhaps less cost, I would take a look at some of the larger Triangle speakers as well.

Both companies are French and sound similar in these regards to me.

For medium size listening room Genesis 7.2f at MSRP $9,000 and possible deals for $7500 new is extreamly hard or impossible to beat even with $30k.

In that price range, I guess I would also have to throw out the mbl option as well, at least if you were interested in perhaps trying something completely different that might meet your criteria.

Normally I';d suggesdt OHm Walsh as a less expensive alternative to mbl, but those are not inherently bright by any stretch, though with the right amp and configuration feeding them, it might turn out to be a non issue. Also the largest OHMs, the 5000s, have onboard tone adjustments that are quite useful for matching speakers to room. Those even new would likely come in at ~ 1/5th your target cost and might be worth an in-home demo first if saving $24000 or so is something you might be interested in.