I suppose it depends upon how symmetrical and well proportioned we feel the fly has to be for our needs, because within reason, I don't think it matters to the fish.
But as a suggestion, I can't ever remember seeing a modest to good quality domestic neck from somebody like Metz or whoever that wasn't loaded with perfectly fine hackles for making buggers. This was always one of the attractions to me of these sorts of necks. Long after the usable dry fly hackles in smaller sizes were gone, I had hackles for buggers out the kazoo. So, I'd say in colors like brown or grizzly with their general overall better natural feather quality, virtually any old domestic neck would do. Black would probably be a little more problematic, but a black #3 Metz or something along those lines would make a lot of nice buggers and also some servicable dry flies.
But than again, I'm not a very fussy tier and don't really care very much about how my flies look.