Hi tinkamom - I'm not sure when you are going, but I found, last year, even when WDW discounts came out, AAA was still a better deal, particularly since you want the dining plan. Last year, when public codes came out for WDW, they issued AAA ones as well, so I was able to save even more $$ on my existing AAA reservation.
I am going to wager a guess, that you are not going to find a better deal on a package with dining than AAA. That being said, even after you book, keep reading the boards to see what discounts pop up - you will have to stay on top of it, because AAA won't!!
Have fun!