Love my ancient 2C's, too. Vandy stuff is getting too $$. The Treos just increased by $600 over the past year or so :(Costs go up, especially with a 'trade war'. Also, Mr. V. might be using some new parts that are more expensive.
If you found the 1ci's 'sibilant' with many amps, I would say you may have a room treatment issue.