Studio B - Paisley Park - no pictures allowed inside, but for $10 you get this photo. The tour was amazing and I think would be interesting to non-fans too. There is a good coffee table book you can get for $25 that has good photos of the interior exhibits.
We saw most of the main floor - two studios A and B. His office, his kitchen, the atrium with his ashes in an urn and two doves in cages. His huge room and soundstage for performances and movies/videos. His party room where locals and NPG members could hang-out. There were rooms dedicated to his most famous records, including instruments, costumes, props, etc.