Proac D Two & LFD LE III

No disrespect to Naim owners. I once considered the Naim Supernait at one point and contacted a guy who is selling a used unit who coincidentally also has the LFD LE III for sale. He mentioned the LFD is overall more musical with better vocals that have more presence compared to the Supernait. The advantage of the Naim Supernait lies in the added features of built-in DAC among other things. The XS is close to Supernait's sonics whereas 5i slightly lower in performance so you can expect how they would fare with the LFD. Another dealer also informed on the same findings. I have listened to the LFD and can verify on its musicality but have no chance to compare it with a Naim side by side.

Of course, everybody has their own taste and listening preference so YMMV.

Ryder is chartible in regards to the Naim pairing. I've listened extensively to this speaker with Naim and Sim as I am considering them for my next purchase. The Naim does the Proac D Two no justice. The Sim integrated was far more musical and open sounding. I run a Sugden A21SE which will better the Sim. I've no experience with the LFD LE III.

I can't tell from your post whether you think the Proac D is a "replacement" for Harbeth because you like the sound of the Proac as much as you like the sound of Harbeth or whether you think that it has the same sort of sound as the Harbeth. My experience, admittedly limited, is that the two sound very different. To me, the Proac was much more resolving, while Harbeth sounded more natural and musical. Even though you've got the itch to buy right now, I'd urge you to take a little time and listen to each before you leap. Good luck.