25 feet deep should leave plenty of room for a couch or two. Make sure you have all the wiring for speakers and the projector run ahead of time. That is much easier to do during construction and it is easy to just put wall plates on. If I were starting from scratch I would also consider adding some soundproofing depending on where the room is located. If it is going to be separated from bedrooms and living areas then that wouldn't matter though.
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