DAZ high-rez is great (imo the best by a wide margin)
DAZ Nadia is great
DAZ Laura is great (although the tan is uneven, I don't know why)
PoserPros Jojo is very good, although her shader version mats looks a little greasy to me (fixable by tweaking the mats)
(I think on PoserPros) Zinnia is pretty good

Edit:  Oops, Grace is pretty indispensible for any black character you might want to create unless you just make your own skin; while you might be able to darken most of the skin down, the palms and soles of the feet will be wrong (typically they are much lighter than the rest of the body on a black person).

Most of the rest are really pretty indistinguishable from each other, just bland creamy featureless skin.  The brand new DAZ release Emma is not what I hoped for, it looks like smooth skin with heavy makeup on.  Oh well.

note: I own all of these skins and I'm not talking about looking at them from promo pics.

My Freebies