For this month's socks I used Trekking XXL (75% new wool, 25% nylon) with Gems on the toe. I have been using 2 circulars for the last few pairs of socks and love it.
I picked up a skein of the new Noro sock yarn from Bella Lana on 4th & Central in Minneapolis and have started working on April's socks. The colors are beautiful but the yarn takes a little getting used to because it is slubby and not as soft as I am used to. I suspect after a wash they will soften.