On the DVC site it tells you when you can book at other resorts (the 7th month mark):
All Other Disney Vacation Club Resorts
Arrival Date: Jan. 22, 2012
So right now I can book at any DVC up to Jan 22 arrival.
Many people will tell you, and it is good advice, that you should book your home resort at 11 and switch your reservation at 7 months during busier times of the year to make sure you have a room. Your plans will be right in the middle of spring break time.