I agree with Disneynutz -- call your guide.
As far as DDP is concerned, don't factor that into your decision at all.
DVC perks come and go. We didn't have DDP at first, and we may not have it again next year -- who knows? Also, with rumored changes in DDP, it may not be worth having.
Evaluate a possible DVC purchase on the value to your family of using it for lodging at the DVC resorts...not all the other stuff.