Hi and congratulations on your trip planning.
Is your family mostly adults, mostly children or a mix? For best value for your buck, I'd recommend either two rooms in a value or a family suite plus one room at All-Star Music. If you want to have some breakfast and sandwiches in the room, and social space for all of you, then the suite would be great. But if you just want a place to sleep, then I think you'll be good in two rooms.
I believe Labor Day through most of September is the best time in the fall. If you're really looking for a great time to go, I'd recommend mid-January through mid-February.
We love the family suite, so let me know if I can help in any way!