The Hegel 360 drove KEF Blade 2 to some decent levels. Not the best amp I have heard with the Blades but excellent for the price. THe 390 would work better on KEFs if it is a bit warmer than the 360. I would choose something from the KEF Reference line to stay under $10K. This does not match what the OP was asking for in terms of warm+warm but that is how I would go.
Oops, just saw the post above. Congrats, Great move.