Smartwool. I bought three pair of "seconds" at the LL Bean store when I was in Maine a few years ago. My feet are warm in the winter and cool in the summer. These three pair are about worn out so I've been looking around for a store that carries them but haven't found one yet. And no, I don't own just three pairs of socks, but I haven't found any synthetic, cotton, rag wool or any combination there of that keep my feet warmer than smartwool.
My only concern with smatwool is their web site seems to list a lot of charities they may not be hunter friendly, but none that are definately antihunter.
The 'Bonker