Searching for the most "accurate" speaker (below 15K)

how about something like a series one magico s3 - there were a few here that had a price in the 11-14k range. the series one s1 could be had at well below budget there is/was an s1mk2 listed a week or so back in the same price range.

if you want something less "straight to the source", raidhos might be up your alley. the ceo told me he likes pairing them with nagra (along with a few other brands)

dealer disclaimer: i carry raidho, but i do not carry magico

Excuse me, any speaker that has rolled off tremble above 12 khz is  far from accurate, possibly ridiculous, depending on how much. If it is true, I don't understand how they can be taken as something that is worth consideration. 

Easy no-nrainer - QUADS 
THE most accurate, natural, transparent I have ever experienced in my 60 years in audio.

For room your dimensions we have special model called Acoustic Preference GRACIOSO 1.0 LE (99 pairs only), if you prefer neutral-natural sound. Right now in special 10.anniversary action -40% off, look to eBay or our web site. Sorry, we dont have dealer in many countries, but we offer 45 days of money back warranty. The cost of purchasing with customs and VAT should not be higher than $ 10000; delivery is paid by our company.
Maybe interesting information for you and other audiophiles. Also our bigger model GRACIOSO 2.0 LE will be very good for your room but cost approx.2500$ more also in action now.
A little advertise for our oudspeakers which are not very well known in audiophiles world.

Marjan, CEO Acoustic Preference-EU

Quad ESL - fast, natural, accurate

and you can also use them to electrocute flying insects!