Out here I grow Dutch. Did not have good luck with English (winter too mild I guess). The Dutch freely multiply and are available at nurseries as well as most fall bulb catalogs. Have you seen John Scheepers (sp?) catalog. Shipping is 20% for us so I've not used them but have heard their quality is good.

I think your zone may be ok for them, but I would check with your local nursery before investing time and money.