We have already mentioned the 50 cd box-set: "Wagner's Vision: Bayreuth Heritage"
here (includes full track listing and details) and so will not comment further. However, if you are undecided whether it is right for you, or simply wish to listen to it, and you have access to Spotify the full box set can be listened to below. Located and compiled here by the excellent, adverting free, and highly recommended Spotify classical site and associated app
Spotify Classical (click the link to visit the Website) after a brief conversation with its owner over at Twitter. Who said social media was without uses.