I would stick to the satsumas like Owari, very good flavor. I planted mine on the south or east side of my house as close as I could get to the house, the house heat will help protect the trees. Buying colder tolerant stock of trees should help also. A big outdoors store in Foley use to carry a "Mobile root stock" citrus tree that was cold tolerant.
http://mckenzie-farms.com/photo.htm
