We've done the Backstage Safari at DAK, both Segway tours (Epcot & Fort Wilderness Campgrounds) and the Backstage Magic tour. We enjoyed all of them with the Fort Wilderness Segway tour being our most favorite.
There are various discounts that may be available to DVC members, AP holders and Disney Visa card holders. The discount when available is usually 15% and on some tours the Disney Visa holder discount is 20%.