Standmount speakers. I have $5000.

Take a serious look at the JERN14 speakers, in particular the JERN14 EH.  They require a sub or two but they are amazing.  I have owned a lot of speakers and these little cast iron beauties are just incredible.  Do a search and check out the reviews.   Good luck.

@usery boxer v1's were my first, "real speaker." powered them with rogue audio gear. as mentioned, they really do like tubes! 

I just got the B&W 805 D3 and couldn’t be happier....excellent quality speakers.

I've owned several standout standmounts over the past decade.

1. Focal 1007BE + HSU sub. This setup was driven by a McIntosh MA7000 integrated amp. Very musical combo.

2. KEF LS50's. Obviously too small for your room.

3. KEF Reference 1's (no sub) driven by a Hegel H590 integrated. Unbelievable set up. Very musical and with far more resolution than the Focal's/McIntosh. Not sure if the McIntosh held the Focal's back or if the Reference 1's are just better.

The Reference 1's retail for 8k plus stands but you should be able to secure a pair for 5k. Currently one pair up on audiogon https://www.audiogon.com/listings/lis9gbi9-kef-reference-1-bookshelf-speakers-glossy-rosewood-pair-1. No affiliation, mine are gloss black. Not sure if they meet wife acceptance... Mine are at the office!

Regardless, I'd recommend a larger boxed bookshelf given your room size. I'm in agreement that the Harbeth's wouldn't be ideal for electronic music.

Good luck!

Ken

I just got the B&W 805 D3 and couldn’t be happier....excellent quality speakers.

They have a bit too much treble no?