I stayed in the Grandstand for the first time on our last trip and just loved the location. I would request building 8100-8400 room range. Reasons:
1. Bus stop is just outside of the building. It is the first stop for the park busses and second for the DTD bus.
2. Grandstand pool is just on the other side of the building. They have the refillable mug station here.
3. It is a short, maybe 3-5 minute walk to the main pool, restaurants, etc.