Are you looking for an an actual case that fits to the form of the Ipad and said device is usable in its case or are you looking for a back only snap on case like the Grip Vue - or a form fitting slip case?
Imo the best "Form Fitting" case currently available is the Apple case by a wide margin.
See pic - Incase Ipad Case and Ipad w/ Grip Vue. Very snug fit even with the Grip Vue removed.