Best 40 to 50k used speakers

@thieliste I am not a Vandersteen fan boy but I do currently own the  Vandersteen 5As.  I purchased mine for cheap so at my price I do not think there are many speakers that can compete.  I did get a chance to hear the Vandersteen Sevens from the person I purchased my 5As.  I did bring my DHT DAC that I design and build with me to hear the 5As.  When we plugged my DAC into the persons system with the Sevens, the sound was fantastic.  I knew what speaker I would want if I wanted to spend the money.  That would be my reference starting point. Go hear the Sevens and then you will have a starting point to hear other speakers.  Vandersteens have been around a long time and reselling them is no an issue.  You can save a few bucks and buy me a pair also!

Happy Listening. 

TAD Ref 1.  Very versatile speaker.

Focal utopia will be my number one pick 

+1 for the MBL 101E Mk II.
I heard them at last year's Highend fair in Munich. It was so much better than anything else I heard so far. Couldn't resist and bought them meanwhile. You need serious amps to drive them, I have the Electrocompaniet AW600 Nemo and am happy with them.
However, it's difficult to get the MBLs used. I looked for a while and then gave up.

TAD ref 1 is a good option thanks like them very much.