I would say go with the AP but, it is a personal decision. With an AP you can buy a Disney Dining Expierence card for $50. It gives you 20% at most sit down restuarants and some counter service places. Also with the AP you get discounts at different shops in DTD. You also get discounts on tours and various other things. You may get the difference back in the amount that you save!
Plus, they have special events for AP holders. For example, next weekend they are having a preview weekend for Expidition Everest for DVC members and AP holders. DH and I are going on a crazy weekend trip to ride Everest! We wouldn't be able to do that without the APs!!
You never know when you might go back during the year!
I say go for it!