Hi. as you already know, the ones i've used, in order of increasing cost:
Audioquest Emerald ICs were very musical, full and warm. not as detailed though..
Cardas cross or golden cross
Transparent Reference Cables (particularly XL older cable
newer version MM1 or MM2
Purist Audio Dominus
they're all good and fit your description. if you need stuff that would be at the level of ARC Ref series/CJ GAT/etc, the latter 2 imho would be appropriate, and the latter 3 are all up to it.
if you are looking for stuff that would work with NAD, the AQ is very good (though of course better cables are still better).