As a little bit of a savings, I would consider a DVC rental.
Rental = Standard $2448, Lake $2928
Direct Disney = Standard $3811.50
Lake was not available for booking but i would expect the price to be above $4000. Even if you manage to get a discount of 25% it still work out better to do a rental.
There are a couple reputable rental companies who you can go with and for some reason through disney there is no lake view availability in Aug, but DVC seems to have some. Just an option to consider. I hate when people over pay for a room. Our first trip to disney was a DVC rental and it was a very smooth process, you can still add on the disney express and the dining plan if you choose. The only difference is that there is no daily maid service, which for us is sometimes better. We loved it so much and saw the savings in actually buying a contract ourselves.