Holm, as relates to the Sumatras I think it is more important with this breed what your source of stock is than it is with many breeds. Cold tolerance I think is an issue of concern, so if you can find birds from a breeder in a climate similar to yours it would probably work out best.
Some people have found the birds do not do well in cold winter conditions? The large tail although good looking to many presents problems for showing, as the long feathers are more likely to be damaged?
That was one of my concerns when I ordered Yokohama's. I am hoping after a couple years ( or before I die to get a cold hardy line) I plan to just breed the ones that do the best over winters (plural)....
I know I will never get a 20 ft tail, but it would be so cool to have....