So I just bought a Hegel H390 and

A store near me that has Hegel usually demos them with B&W speakers so that should work great. 

Harbeth 30.1’s with a pair of RELs. Sounded great with my H590. Wilson Sabrina X’s sound even better but a bit more than your 10K budget.

Congrats on a very wise choice of amp. A friend has the 590 with Focal Kanta 2s in a room similar size of yours. I thought it would be a little bright for my tastes but it was not. 
The beauty of the Hegel is it can run sensitive or not so sensitive speakers so you have many choices. Several good ones above and
in another 12 months you might manage to hear them all.
You can go for max detail, max warmth or somewhere in between.
Open Baffle, Box or planar/electrostatic are all quite different.
Get some good XRCDs and start listening. 1st stop RMAF in Denver
in October. Love to know what you buy.

The Hegel drives 390 drives just about anything with aplomb: the world is your oyster. Try whatever tickles your fancy that suits your room(s) size and budget.

Because there is such a wide range of possibilities out there it is impossible for a third party to make the right choice for you.

+1 Kef. maybe Ref 5 or if you can, blades? 

also, using ethernet into the hegel, note that you will hear significant SQ improvements with a BonnN8 network switch (with LPS).

I understand that an etherregen (with LPS) will also make similar improvements i the Bonn8

The hegel is a great amp and it will improve further with noise reduction from ethernet and also from power supply/power conditioners.