I have three fabulous DK-weight yarn bases, and you can see them all here.
The first is Buttery Soft DK, which is made of 45% extra-fine merino, 45% baby alpaca, and 10% silk. It's really luscious.
The second is Donegal DK, which is made of 85% superwash merino and has 15% nylon nebs as well, giving whatever you make a subtle tweedy look.
The newest is Squoosh DK, which is made of 100% extra-fine superwash merino. It's stretchy, squishy, and wonderfully soft.