Best tube preamplifier for under $15k

I have McIntosh pre amp c2600 and amp MC302 and I am happy with its performance. I expect the C2700 with the improved 2nd generation modular DAC is worthy of consideration. 
What amplification are you using?

My preamp sounds better than any of the above previously
mentioned units. It is a lot less money too.

Yep, I do not use one. 

If I change my mind I will use a Supratek.

Shindo Monbrison....one of the very best I’ve heard under $20K range. 

Nelson Pass Korg Nutube B1 will offer a Performance that is worthy of being experienced in any system

https://www.stereophile.com/content/recommended-components-2020-edition-preamplifiers

All under 15K

Ayre Acoustics KX-5 Twenty

Pass Laboratories XP-22

PrimaLuna EVO 400 Tubes

PS Audio BHK Signature Preamplifier