What is needed is a B7 and a great TT in one room and then an A/B (to the extent possible).
Well, I have a decent turntable setup, not great by any stretch of the imagination.
BUT, I've been wanting to hear a Lampizator DAC, so if someone wants to send me a B7, I'll compare and write it up.

All kidding aside, I don't think there is anything wrong with having a reference level DAC and TT setup at all.
For classical music like the OP stated is his preference, there is a ton of available vinyl both new and used, that probably would provide excellent sound quality if properly cleaned and maintained.
I also don't think the OP would have to spend 20K+ to at least match the sound qualities of the B7. Digital and analog sound inherently different, but there are varying levels of overall sound quality to be matched.
I think if you matched the price range of the B7, which I don't think is 20K, you would be sitting pretty. Off the top of my head, a Basis 2100 w/Tecnoarm, Dynavector XX-2, and a Herron Phono Stage would pretty great, and all could probably be found used for 10K or less. New, maybe 12K.