What are the speakers you think you need to replace? (Have you searched out the possibility of replacement driver(s) or even, possible in some cases, reconing them (which includes voice coil)?
Naim are assessing the amp, but they are able to replace the drivers. Our local Audio T will be picking up the speakers this week to see if they ‘save’ the cross overs.
I freely admit I’m biased, but a secondhand pair of B&W 804s should come in under £3k and will respond well to your amplification.
I have Arivas on my bedroom system, so I know how good they are. 804s (mine are D2s) are better, though, and my amplification is a notch down from yours so they should sound even better for you!
We are nearly there, waiting for Audio T to fit drivers. The 250DR needed a replacement transistor.
My wife was asking when things would be sorted out this morning, she would like to hear the ‘digital album’ of guide tracks for her choir practice - curated by myself with all of the tags and things.