Speaker recommendation £2-10k range

Hi everyone, I’m looking to upgrade the sound quality of my system for listening to music. Music taste - pop, rock, indie, and a bit of rap when I’m feeling frisky.

I currently have a Denon AVR 4311 (that I plan to upgrade to an AVR with Dolby Atmos). I play music at lossless + dolby atmos via Apple TV (but in the future would expect to be able to play high res lossless 24/192) through Apple Music). I have two ceiling mounted Dali Phanthom E60s for surround sound, rear left and rear right. I have an SVS SB-1000 Pro subwoofer, hiding behind my TV. On the photo here you can see my set up - the lounge area is about 3.5m deep by 4.5m wide. The room continues on for another 5m but the main aim is good sound at the sofa.

The weak link is the Libratone Lounge for front. It’s good with vocals, but otherwise can sound quite muddy, dull and not very dynamic, and guitars sound awful. I’d like to replace this with floor standing (or bookshelf on stand) speakers to the left and the right of the tv. They need to be at max 40cm deep at the base, otherwise they’ll stick out too much into the lounge area.

I use Audyssey on the Denon for music - MCH stereo, dsx off, dynamic volume off, multieq to flat, cinema mode, as that’s just what sounds best with my setup for music.

Happy to spend in the £2k - £10k region, prefer used. I don’t mind spending for better sound, but I’m guessing there’s a sensible limit given my space, setup, sub, avr etc that may cap sound quality. AVR pairing for recommended speakers would be helpful too.

Any suggestions or advice would be most welcome! Thank you.