I have heard neither, but the Manley Stingray and Audiomat Arpege are both highly regarded.
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I own the Audio Refinement currently. It's a nice piece. Very solid little amplifier. Fairly strong in the bass region. I actually just upgraded to a Pathos Classic One and I'm waiting for it to arrive. I would advise against the Anthem INT 2, I had this one also and did not care for it much. Sonically it was okay, but the volume pot was the worst I've ever seen, the remote was the same way. If neither of these two items bother you and you can find one for under 600, they're not bad. I can't speak on the musical fidelity pieces, but know they get a lot of praise from the reviewers.
The Nait might not be a good candidate for sensitive speakers. Don't get me wrong, I'm not Naim-bashing. I own a Nait 3 and love it. But they aren't the quietest amps around, and I've read that the hiss is unbearable with speakers over ~93 dB sensitivity.
I had a Primare A10 that was wonderful - sweet, smooth AND quiet. Their stuff is worth a listen, if you can find it.