I also own the M-60s, and ran through the following preamps:
- Modwright LS-100
- Decware CSP-3
- Don Sachs Model 2
- LTA MZ2-S
All of those were great and my favorite by a small margin was the LTA, until I found an Atma-Sphere MP-3 for under $3K, and it was game over. They're a stunning combo, as you would expect.
I'm guessing all the preamps you mentioned will sound really good too, but always keep your eye out for an MP-3. I waited years to find the right deal on one, but it was totally worth it.