Actually, i would start shopping now and then set it up right when you move.
By the time it comes to move you'll have just entered a good palce most likely as far as your water parameters, your base rock will be move alive each day and the sand will have started diatoms and butrned through them by then the life in the tank will be rolling right along.
If you move a tank, I would always recommend new sand or rinsing your current sand. Lots of nasties get released when moving live sand. Also,you'll probably have stock by then and you gotta worry about fish stress.
Plus if you start shopping now you can have a heck of a setup.