I really love Lorna's laces, both shepherd sport and shepherd sock. My other loves are Regia, KPPPM, Cascade fixation, Cherry tree hill, Knitpicks (sock landscape, sock garden, sock memories)
I HATE and wouldn't ever use again even if I was getting payed, Knitpicks essential sock yarn. it's rough, stiff, feels like crap, difficult to work with. it has the same fiber content as the simple stripes, but it feels nothing like it. the Simple stripes is a decent yarn IMHO, but the essential is crap.