"I want this preamp/phono to be absolutely natural and transparent, may be just a bit warm."
Sounds like an expensive tube preamp to me. I assume you mean by preamp/phono line stage and phne preamp.
Aesthtix
Allnic
ARCph7/Ref5
CJ ART
Dartzeel(SS)
J&R Essential 3160
The Allnic is the latest rave. At around $20k kind of steep.
Good Luck