Check out the Swan and Dolphin. Great hotels within walking distance of Epcot and MGM/AKA Hollywood Studios. You will also want to look at the Downtown Disney hotels, Doubletree, Hilton, and other chain hotels in the DTD area that regularly have government rates. My experience has sometimes shown a higher government rate because this is standardized to per diem rates. So, always check and also get the "best rate" by calling the hotel directly.