You nailed the sound of the JM Lab Electra's right there, wonderful sound but it does hint of some sibilance, my suggestion since you are in the UK is to try the Proac, ELACs, Spendor, If you can swing it, try the new ELAC 600 X-JET standmount, at a more modest amount the 301.2 JET also come into play, I am not familiar with the models in the proac range, but I like what I have heard from one of their floorstander models.