Hi! I'm going in August as well and I cannot wait
!! If you have your heart set on a moderate resort, I have stayed at both the Caribbean Beach and Coronado Springs and have loved both of them. They are pretty spread out so if you don't get a preferred location room then long walks could be in your future.
Now, if you would be willing to save yourself some money and try a value resort then POP Century is the way to go. We have stayed there 3 times and have never been disappointed. Again, ask for a preferred location and you'll be near everything. The theme is perfect for small children and pretty much the only thing you don't get from a value resort vs. a moderate resort is a full service restaurant (which we don't seem to miss
).
I hope my two cents helps. Good luck in your planning.