Cart before the horse.....The right speakers are what meets your SPL levels/room requirements and is pleasing to your ears and music tastes.
Don't force your speaker choice to match existing components, expecially at $5K price levels. Choose speakers first, independently, and connect with your existing components and, if necessary, over time, trade for components that complement them best. Ultimately you will be more satisfied in the long run.
The speakers have, by far, the biggest influence on the sound. They also have the most compromises in design. Differences between one good amplifier and another will be minor compared to the overal impact that your speaker will have on the way it all sounds....speakers are where the rubber hits the road.
While audio waveforms can be produced and manipulated digitally and electronicaly with extremely high degrees of accuracy, in relative terms, all speakers introduce tons of distortion and colouration, especially as volumes are increased.
Just my two cents...I know many others will disagree....but at that price level you should simply get speakers that really knock your socks off and ignore the other components you already have!