If money is an issue, I would recommend 2 rooms at the All Star Movies (request connecting rooms in the Buzz section). The rooms are fine and with connecting ones, it will allow people to move a little more freely. The pool, foodcourt, main building and bus stop is a very quick walk. There is also a parking lot off to the end of the Buzz & Woody buildings. Movies is the last stop coming and going for the busses that are shared with Sports & Music. We stayed here last September and were very pleased.
If possible, for a little more a night, I would recommend 2 connecting rooms at either Port Orleans French Quarter or Caribbean Beach. My family and I have stayed at POFQ several times and have always been happy. The resort is small and no matter which building you are in, it is a very quick walk to the main pool, the foodcourt, as well as the main building and bus stop. The busses are shared with POR (Dixie Landings), but POFQ is always the first stop coming and going, so you know you will get a seat. We find this resort very quaint and have never had a bad visit. I have heard so many great things about Caribbean Beach, that I have ressies there at the beginning of December. Although this resort is spread out, I requested a room in the area closest to the main building with the foodcourt and bus stop. I realize that this is not guarenteed, I put in the request anyway. They have redone all of the rooms, so I'm anxious to stay here.
Now if money is not as much of an issue, I would recommend a 2-bedroom room at the Wilderness Lodge Villas. The Wilderness Lodge is just breathtaking, especially at Christmas time. By getting a 2-bedroom, this will allow the adults to have their own beds and the kids can either sleep next to mom or in the living area. This can also save on food, since there is a kitchen in the villas.
One big suggestion would be to make sure you visit as many of the resorts as you can over that time period. Each resort is decorated to the hilt, but customized to that specific theme. At the Wilderness Lodge, look at the tree. There are tee-pees as ornaments and moose antlers in the middle of the wreathes. Also, most of the deluxe resorts have gingerbread houses. The one at the Floridian had a train going around and through it (took over a half hour to pull my train enthusiast nephew away.