But I'll continue (sorry, Paul)... I've heard the RFC Canterbury's with that same M520, which I bought from Tom (Montesquieu). A true audio epiphany. Mullard circuits and Tannoys; anyone who hasn't heard and is interested in the varieties of audio experience just needs to seek out these things. Tom has a house steeped in music, with a harpsichord and clavecin in the hall, so you can hear the real thing alongside the representation. I've not heard such full range fidelity; across the spectrum, without any undue emphasis and such exquisite openness.
I'll stop there and eventually I will start a thread on the RFC Tannoys rather than bang on about them everywhere else. I only go on here because it would be the most perfect step for you, Paul, with such a nice big room. But I realise the desire for discrete adn unobtrusive boxes.
If you can find some Devores, I suspect they would be really good with your Jadis.