Which one to choose between two 80K$ tube amps?

shkong,
I did not know about the Silbatone costing $100,000!Something I don’t understand is with an amp like that, how can you possible settle for a Line Magnetic? Only because it has more headroom? Don’t you gravely miss the glorious sound of the Silbatone? Believe the LM is 845 based. I am a die hard 300B guy and tried an 845 in a Viva Solista once and sold it right away. It seems an 845 may have more headroom but lacks the wonderful musicality of a great 300B amp. And, G-d forbid, a SS “sand amp”.
Actually, that is another Forum question!
You mentioned a WE speaker system. Seems the financial is not a significant issue, so hunt for one and go for it! And enjoy the Silbatone. Seems there is no other amp like it. I understand that the 300B is the only tube that was specifically developed for voice/music.

There is an Ongaku currently on AG for $52k.
Bet you could get it for much less.
IMO, best amp ever made.
The Berning is second. Very different sound. More SS sounding and more transparent but lacking the SET MAGIC.
GO FOR THE Ongaku!

Clearly, both are SET tube based. However, when I refer to “warm and cool” I speak of the designer’s tastes IME. 

Two amplifiers that represent the pinnacle of decades of design development of two legends in the Audio world, Kondo san and Berning san. I speak from a listener and enthusiast’s perspective. Not from a technical one. I do not discount the importance of specs and technical aspects. But present the importance of enjoying the music. If someone’s tastes lean toward the “cool and neutral” presentation, the Berning is perhaps the ultimate example. If one’s tastes are more the “warm and liquid”, the Kondo may be the best there is. Both amps are highly “musical”. Perhaps the classic yin and yang. Personally, if I had the cash and inclination, I would jump at a chance to own the Kondo for $30+K less and never look back. Especially considering the “taming” of that plasma tweeter!

Shkong,
I would get a pair of Avant-garde Duo Mezzos. Check out the YouTube “Garrard 301 vs Studer”. One of the best recordings on YT.
The system uses the AGs pushed by a Nagra 300B amp.
Since you already have similar silver trannys to the Kondo and a very nice 300B amp with WEs, a super efficient speaker will produce a great system able to fill any room! Don’t think you would need the subs and crossover with the AGs. Simple is always best. Not to knock the Jadis since the Jadis sound may be the ultimate PP tube beauty, but 500lbs and 6 chassis!!