Lewis 1212 -- I would NOT purchase a package, especially not now. The past few years discounts have plentiful in July, but they tend to come out later than January. I would reserve room only through the central reservations office. All you have to pay now is one night, and you can make changes up until 5 days before arrival.
How into pool amenities such as slides and spas are your teens? My teens HATED All Stars pools and we all disliked the transportation situation at Fort Wilderness, although we loved the cabin itself and the campground atmosphere. Our trip to FW was short, and we didn't even visit the pools, but I know they would have been unhappy with them, too, because they are plain ole unthemed pools. We have a neighborhood pool, so they are used to plenty of pool time.
My suggestion is that you make a room reservation, then keep watching for discounts and try to upgrade to either one room at a deluxe or two rooms at a moderate. We are very happy with CSR and PO-R (two rooms now), but my family's #1 choice is YC even though we only have one room and one bathroom. The pool and location is that good!