Speaker recommendation £2-10k range

Not sure what sound your after but IMO the Acoustic Energy AE 520 is the most versatile/refined speaker around $5k new I know of. Balance is it’s strong point does not call attention to any frequency point. Could it be boring to you? With any audio component a store demo is a must.

Thanks for the tips guys - I'll look at the KEF R, Dali and Monitor Audios. Researching online it seems that Arcam do the best AVRs when it comes to music sound quality, ie the AVR 21 with Dirac Live, so it's about pairing speakers that go well with this unit I think, and also working out whether these higher end speakers will actually sound any better in my setup than lower value models, eg will Kef R11s sound better than the Q550s, given the room, AVR etc?

I’ve settled on Harbeths after owning many nice speakers over the years. I ,and many like myself find the overall sound of the BBC class of stand mounted speakers to be our cup of tea. I have two pairs set up for daily listening now. One pair is the 7es-3 for my turntable and the hl5’s for my streaming music. Two separate different tube integrated’s powering each pair. I want for nothing more and have discarded many much more expensive speakers. And the turntable powered smaller one ,less expensive ones sound better than the streamers by a small but discernible difference. I suspect that a better streaming device may help but what I’ve got is very very good. They are well within your price range for new examples and nearer the bottom for used. PS ,I’d never buy new ,only good used ,that’s just me

In that budget, I would highly recommend ordering a pair of Daedalus Muse speakers.  I would take them over Harbeth, Spendor, KEF, or any others.  They are custom-made, beautiful, and have a fabulous sound, They may take a bit of time as they are made to order.  Buying off the shelf: Pure Audio Project Duet 15.  

Take a look at/listen to Living Voice - they are incredibly musical ad allow the equipment to get out of the way. I have just ordered mine.

I had both the Dali Rubicon 6 towers and KEF Reference 1 monitors in a similar sized room.  I actually demo’d them side by side in my room and was able to A B them for quite awhile.  Both were extremely similar sounding and fantastic.  I wouldn’t hesitate to recommend either.  It was surprising to me that the monitors sounded so full and had as good of a low end as the towers. They were similar in price as well, around $4K on the used market.  

Look at KEF’s R series. You didn’t say your room size so I can’t recommend a model.  
All the best.

@sach160 

Yeah I'll bet the Kef and Monitors are on the same playing field as the Dali.

Anthem has room correction software called ARC and works very good. I'm using their 2ch stuff in my system and have been very happy.

https://www.anthemav.com/products-current/type=av-receiver

Thanks. The rubicon 6 would fit. Are these in the same quality range as say the kef k11 or monitor audio gold 200? Avr wise given my less than ideal room, I think an avr with dirac would be better. Any suggestions? Is there an avr good enough to get strong performance from these speakers or would that require separates? I’d like to avoid adding an amp so I guess it’s about finding a combo of avr and speakers that work well together. 

Take a look at the receivers from Anthem, a definite upgrade over your Denon. For speakers, since you have Dali already take a look at those