Best tube preamplifier for under $15k

I haven't tried enough to declare any best, but I will concur with those above who vote for the Don Sach's 6sn7 pre, I love mine. 

I'm also surprised more people who are into tube-based pres aren't mentioning DHT designs.  They are challenging to build without noise/microphony, but the above designs by Thomas Mayer and Vinnie Rossi provide two well-reviewed examples.  Allnic provides some others that I'd love to hear.  Out of curiosity (started by 6 moons and my ownership of Coincident speakers) and the fervent online following of DHT designs I'm having Radu Tarta build me a custom two-chassis unit based on the high gain EML 20AM tube.  Hopefully in a couple months I'll find out that the DHT adherents are correct.    

I just had this built and do agree with the people who claim that once you go to a DHT preamp, you'll never go back to IDHTs again. Just got it on Saturday and am already hearing more natural holographic detail out of my system than ever before. Really looking forward to the full journey as all the iron breaks in.  Just sold my wonderful and heavily upgraded Don Sach's DS2 6sn7 linestage. I only have one source, so I'm just using it as a voltage gain device, but multiple source switching is available.

https://simplepleasuretubeamps.com/2020/12/30/shiny-eyes-eml20a-preamplifier/

@mahgister  I think it's worth repeating (I don't have the energy to go back and search for the reference).  And always good to visually see the duplicate votes in a situation/thread like this.