I buy SmartWool socks from campmor.com and then use a liner with them. Actually the liner I use is just the black 100% nylon dress socks from my local Walmart. Not terribly fashionable, but it works well.

The reason I still buy the SmartWool even though I use a liner is that I will use the wool socks w/o the liner in my sleeping bag on cold nights. The SmartWool is much more comfortable than the old-style wool.