Another good source of information might be Curzio at the Kenosha Potato Project. He is in Wisconsin so the climate might be similar. They focus on heirloom and rare varieties as opposed to more commercially available varieties.
http://kenoshapotato.com/
http://www.curzio.com/N/PotatoCatalog.htm
There is a Facebook group for this that can be used for asking questions:
https://www.facebook.com/groups/316831657858/