I have a rain suit by Herters (I believe) that I got at Cabelas for about $60 on sale. It is soft almost like a microfleece on the outside and quiet while the inner layer is kind of plasticy like a windbreaker material of sorts. It blocks wind like a mad dog and doubles as a rain layer as needed. The last time I went shopping for a "windproof" layer I put my hand on the back side of the sleeves of various garments and just blew right through the cloth. I figured if I can blow through it so can wind. The only things that I found that I couldn't blow right through were the rain coats.
I've found that in most winter weather here in Arkansas, having that on adds more warmth for the weight/bulk than any other garment I've ever owned or tried. I don't really think it in and of itself has much if any insulating properties but the windproof barrier helps to keep my body heat against my body and from escaping unlike what happens in fleece, wool, down, etc. For the majority of the season I'm comfortable in just a tshirt, button up, fleece vest, and my rain jacket up top and a pair of pants and rain pants down bottom. Its truly incredible how much less clothing you need when the drafts can't rob you of heat.