What speaker to replace ESL 63?

Thank you everybody for your advice.
The only problem for me is that I am on a limited budget ( from US 2K to 4K) and I have to forget top of the line Piegas Sound Labs and so on...
I think it will be worth considering a pair of used but in good conditions Quads ESL 63 or a pair of 988 but I am hesitating. I have encountered reliability problems to hygroscopic breakdown (humidity and fungi) due particularly to the fact that I am often abroad and the Quads remain disconnected.
The Gradient Revolution seems a possible replacement to the Quads. The bass panel Gradient SW 63 that I use for bass reinforcement is extremely articulate and dry and is very weel built and reliable.

I am aficionado of chamber music and lied and I have not heard until now other speaker capable of rendering all the nuances, tonal shadings and emotions ( joy, anger, sadness) contained in the various interpretatons of barytone and soprano voices as the Quads do. Listen to the various performances of Schubert lieders recorded during thirty years by Dieskau and Schwarzkopf.This latter is one of the most difficult voice to render in a soud system (and impossible to render from a CD support).