Tube pre-amps $3500 under to add "warmth"

I'm interested in thoughts. Looking to add a touch of warmth to an all solid state digital based system. I am considering the following but have not heard any except VTL.

Modwright SWLP 9.0 SE
Dodd battery
Supratek Sauvignon
VTL 5.5
Audio Horizons TP 2.0

Anyone had the opportunity to compare some of these?