Which speakers are ideal to pair with a Yamaha as3200

Good morning everyone! I kindly ask you for advice on which speakers could be ideal to pair with my new Yamaha s3200 amplifier

I currently have some Kef LS50 meta but I would like to make a qualitative leap.

I have to buy Bookshelf with a maximum depth of 36 cm and a maximum width of 25

I'll also post a photo of the room. The important thing would be a large stage and a detailed sound... I won't listen to them at very high volume and I also have a Kef KC62 sub available that I can match in case.

Budget: Up to 6000 euros

My current ideas: ATC SCM20psl, ProAC D2R, Platinum 100 audio monitor

Thank you so much

https://ibb.co/RpCccTVz