I'll second Cabella's socks. I bought 6 new pairs of socks and liners for my son and I each last summer for a couple weeks of camping/hiking, and I looked around a lot. The Cabella's ones we bought were medium weight hiking socks, and polypro liners. I don't think the same exact sock is still sold, but, I saw in the Camping&Backpacking catalog that they sent recently a similar one, called Trail-Lite. They are $7.99/pair for 3 or more pairs. They are a 78% Merino Wool, 20% stretch nylon, 2% spandex blend.

I have a bunch of other socks from Smartwool, LL Bean, etc which are more expensive, but, not necessarily better. For the price, the Cabella's brand ones are great. Make sure you get some polypro or silk liner socks too, they will help keep your feet dry, and do wonders to avoid blisters.