Target has a great line of sweat wicking shirts for about $10 each. I think they're made by Champion. They are 100% polyester, are a tight smooth mesh and transfer moisture very well. Use these as your base layer with light weight Polartec as the next (add another Polartec jacket over this if it's really cold) and a Gore-tex type shell as the outer layer. I've used this combination cycling, XC skiing, running and winter fly fishing for years and it is bullet broof.
FYI: Synthetic fleece is far superior to wool in my experience.