Add me to the fans of wool. I am amazed that what I thought was an out-of-date fabric works better than any synthetic at the temps you are talking about. Definitely get some wool socks. I went riding with a group today in 40F temps, and I was the only one who didn't have to quit riding because my toes were cold. My winter running clothes also do double duty (skull cap, baselayer, etc).
I stand and rejoice every time I see a woman ride by on a wheel...the picture of free, untrammelled womanhood--Susan B. Anthony