I give a talk at Monticello every fall on fall and winter gardening, based on our experience here in central Virginia (zone 7A), here's a link to the handout I give with the talk, it's got details on varieties and planting dates that work for us --
http://www.southernexposure.com/sout...de-ezp-38.html
(I actually need to update the online version, I revise this some every year and we haven't revised the online version since 2009... ah, one more thing to add to the to-do list!)