So far my favorite sock yarn weight has been GGH's "sport" Weight with which I made these:

Ravelry has this listed as "sport" weight, but yarndex.com as DK. I got this yarn from my secret pal exchange here on KH last year and it's STILL my favorite so far!
I've enjoyed knitting socks with DK/sport weight much more than with Knit Picks' Essentials which yarndex calls a fingering weight.