Recommended Preamp for Pass Labs XA30.8 and why

DAC: MSB Analog
Transport: MSB Platinum DATA CD IV
Cables: MIT Shotgun S1.3 Interconnect & Bi-wire speaker cable
Speakers: Esoteric MG-20

Considered Options:

Audio Research LS27
Conrad-Johnson ET3SE
Aesthetix Calypso Signature
PS Audio BHK Signature
Luxman CL-38u 

This is my very first post in the forum.
Since my speakers' balance has clearly been optimized for clarity and detail rather than warmth and richness
according to Stereophile's review, I prefer a tube preamp.
The MIT interconnect comes with adjustable impedance switching, so impedance matching isn't a major concern.
I prefer a smooth, detailed & balanced sound with wide and deep soundstages. 
Any suggestions will be appreciated.
Thank you so very much.