Its not fancy, nor is it very attractive, but ...

I wear two layers:

Inside I wear a pair of black nylon dress socks that I bought from the local Walmart - they come in 3-packs. Make sure they're not cotton. This is the odd and no-so-attractive part, but they are durable and dirt-cheap.

Outside I wear a pair of good Smartwool hiking socks - I think they were called "Hiker" (Smartwool has all sorts of different kinds of wool socks).

I like Smartwool socks because on those real cold nights I can also wear them without a liner at night in my sleeping bag to help keep my feet warm. Regular wool is so itchy to me that it drives me nuts - not so with the Smartwool. The wool socks make a huge difference when its cold and I'm trying to sleep.

I've also been known to wear the Smartwool by itself when just hanging around camp - not hiking, but I do worry it puts more wear on the wool sock than when using a liner.