Out of curiosity, why have you discounted the VTL? They make some outstanding line stages.
Audio Research Ref. 3, Ref. 5, or the Ref. 5se.
I am looking to add a Audio Research preamp. Looking at the Ref. 3,5,5se. The 5se is a bit high in price.
I have a Wadia S7i CDP up front with Pass Labs XA100.8 amps. I am using Vandersteen Quarto Wood CT speakers. Witch Audio Research would make the best sense to go with.
Thanks for the help Russ.