Need preamp recommendation

I second the Pass XP 20.  Use the best interconnect and power cable  you can afford 

I will provide two recommendations based on my own personal experience:
Backert Rhumba - if you are looking for a very fast, neutral sound, with a holographic soundstage, super low output impedance
Aric Audio Special 6SN7 - if you want a fuller, more rounded sound (including rounder bass), also with a huge atmospheric, holographic soundstage.
Love both, easy to live with either, and match well with SS and tubes amps.  Customizable sound based on the tubes of your choosing / both are tube rolling pleasures!

Atma-sphere MP3 or MP1 if your budget can hit that.

World class and never boring. I used to own VAC whilst i like them i still consider the Atma a step or two above. 

VAC is warm but kinda gets boring its not as dynamic as Atma and over time you get to realise the warmth is sacrificed for other much-needed attributes one needs to get a musical setup

I suggest a atma-sphere MP3. Fully loaded pre amp its more of a destination pre amp rather then a merry-go-round 

The best Wyetech Labs Preamp you can afford.