This thread is a wild ride! Thanks Kringle77 for entertaining reading. A good, realistic look at how confusing speaker swapping is in the real world.
TL;DR for the whole thread:
CTS STV rules. Lets find the modern equivalent for a custom 810.
B810 is too boomy, and past experience with both Webers unimpressive. Used as examples of what we DONT want.
Actually, the Weber 10FL is the best thing ever. Problem solved, get Webers if you want vintage tone.
Special neo B810s come and go with little fanfare, but they may be the best CTS replicas, our original goal.
The original boomy B810s start getting praise. Mass confusion.
Weber 10FH arrive and are now the top choice, but unsure where the goalpost is anymore.
Regret for selling neo B810s, they are retroactively crowned best.
Regular B810s with heavy use of wool highly praised, great speaker now.
Lots of combinations.
Fane 10-125 come from nowhere and take the title away from... I can't remember who.
In the end, nothing as good as a Berg 610, and the CTS is never mentioned again. What 810.