So I just bought a Hegel H390 and

I am considering a Hegel integrated for my system upgrade.  One of the things I have read about this line of amps is that they have the ability to drive many many speakers well.  

M

what speakers under $10.000 sounded the best.

+1 @hilde45 — there’s no way for us to know what might sound “best” to you, which is really the only thing that matters. You really need to share what sound characteristics you’re looking for and are most important to you to make any kind of a meaningful recommendation.

The new system is going to go in one of two rooms.  The first is carpeted, 15’x15’.  The second is a carpeted, 15’6”x20’ with five doorways, one of which is 9’, and one is 6’. There is two doorways and a “pass through” on what will be the back wall. 
I hope this helps.

JD

I've not had the H390 but am confident it's a gem and very powerful. Indeed, this is so capable that without some further parameters (room size, music preferences, etc.) that $10k is going to open up an unmanageably long list of speaker choices for you. If you provide more clues about what might work for you, this thread might wind up being more helpful.