Nice greenhouse. I was thinkin' of settin' up a small one this spring.
Anyway, You can use any kind of Durban cross. I did some Durban x Skunk and it was the easiest shit ever. I watered them maybe 3 times, and never had to give any nutrients. Another rule of thumb that I use is that , "If its skunk, it'll probably grow." So, any kind of skunk cross will be safe. A lot of breeders say "mold resistant", and if you read around you can find reviews noting cold tolerance, and other useful information.
I've lived in Maine, and Florida and I can't think of any place on the east coast that will present a consistent problem if you plant in early may and harvest in oct before weather turns to shit (in the north). Theres just always that freak chance of snow in late september depending on where you live.