I am looking at the Acoustic Research Reference models. Thee is a REF-1 on USAudioMart, and a Ref-3 on Audiogon. I don't want to keep buying and selling preamps. I have lost a lot of money doing that. The next preamp I buy, I will keep.
I agree about the LS25. The LS25 is very difficult to find and is rated very highly as it used the 6922 which allows for tube rolling, whereas later models moved to the 6H30.