Just tell the breeders that you're contacting that you are in the process of looking for a house and moving, and that you want a kitten AFTER you are settled in. It pays to be upfront about your circumstances, and if you are not ready in time for the next litter but have maintained an interest and contact with the breeder they will keep you on their list for the next breeding.
I'm really hoping it all works out for you, having followed your threads about wanting a new kitten and asking about different breeds and finding breeders I feel nearly as excited as I would be if I were looking for one myself
please keep us updated!!!