What speaker would be good for Krell rack?

Have a Krell KSA 300S which could probably run anything as it goes stable to 1 ohm@ 2,400 watts.Matched with KRC2/KPE.But I am running tubes and horns now.Thinking of going into D amp (that Wyred integrated looks like it deliver great value maybe match it with smaller but current needy speak in more compact cooller package if I might give up a tad of sound quality.Again not using the Krell amp now so should sell).Trying to think of speaker for amp to do set up for friend with used speaker at $3K to $5K which would use krell current,bass grip and help with the metallic mids.Sonus Faber Extrema monitors?15 ft to 20 ft room.I am into speakers that deliver high cost to quality ratio so maybe big Usher Dancers?Totem Winds?Looking for leads.Might use it myself might flip it for more compact system.No Apogee's as they are out of production though Diva's would be great match and while Maggie love to eat current they are bad match with Krell.I know this kind of stupid post like "What's a good stereo" but who knows what you guys might come up with.
Cheers
Chazz