I believe that the first two weeks in May are THE BEST time of the whole year to visit WDW with small crowds, all the beautiful flowers, and the weather isn't to hot yet...You'll have a great trip.
That time would be Regular Season I'm sorry, I'm not sure about the moderates but I believe that WL and AKL Deluxe Resorts where $119.00 last May with AP, but not 100 % sure...maybe someone else will remember and post.