For male characters, it's easily Kooki99 right now.
Anything else? Any of the big names, really. Bluejaunte, Raiya(/OOT), Virtual_World, Mousso, Colm Jackson, CynderBlue (though some of their skins tend to be way too pale, but definitely works if you're looking for a vampire-esque character or something), HID3D, VYK, emrys, P3D. Some of TwiztedMetal's stuff is pretty sweet when they aren't getting over-stylized.
Daz skins have gotten to a point where you're buying for a certain look, imperfections, etc. and not so much quality anymore as most of them now tend to be about the same. Short of the quality differences between 8 and 8.1.