Yes, with a party that big getting two rooms that are adjoining will be your cheapest option. The villas are great if you want a full kitchen and a living room, but they are very expensive!
When are you going? There is a room discount out nor for select dates in November and December. Disney visa holders can book a room discount or a package discount for select date January 2-march 3, and those same deals will open up to the public on October 10.
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