You can purchase the quick service plan, the regular plan (think that's called "plus" these days) or the deluxe plan prices will be the same as for anyone else except that DVC members are exempt from paying the peak pricing over some holiday times. Also, DVC members do not have to purchase tickets to add the DDP. The Dining boards contain some stickies explaining the level of the plans and what the prices are.
Dining plans are added thru Member Serices, must be added no later than 48 hours enforce your reservation date, and must be paid in full when booking. Everyone in the room must have the same plan for all nights of the reservation.