rkfaberdds,
We are in the same boat, I am in the process of choosing a preamp as we speak, and am making my decision this week....stretching to $6,000 will bring a few really good preamps into the mix. The list I have as of this writing after adding and subtracting some options.
(1) Aric Audio Motherlode II $5,125 or Motherlode XL $6,125 - https://aricaudio.com/
(2) Backert Labs Rhumba 1.4 $5,000 or used Rhumba Extreme 1.3 $5,000ish if you can find one. I was able to find a new Rhumba Extreme 1.4 for a discounted $7,300
https://backertlabs.com/linestages-no-phono
(3) Atma-Sphere MP3 Mk 3.3 $5,650 - http://www.atma-sphere.com/en/mp-3.html
(4) Linear Tube Audio MicorZOTL $5,750 with balanced inputs and Level 2 upgrades
(5) Audio Research Ref 5SE - Used around $6,000 if you can find a good one
Best of luck!