Re: Socks?????????
Smartwool for sure, if I was gonna be out in it, they're what I grabbed when I was there. Make sure and check any sock's material content before purchase, there are many sold that contain cotton, you don't want those. Change any sock often, nothing lets you know you're screwed quite like pulling your foot out and finding your toes surrounded by ice.
I was never one for packing, much less digging rocks out of the frozen ground, but I'm a huge advocate of chemical warmers, not routine use but always on hand just in case, and good for warm boots in the morning, which does wonders for morale.