Daniel Barenboim, Bayreuth Festival Orchestra, 1991–1992, is on my do-not-buy list after seeing a You Tube clip of it with a Rhinemaiden cavorting with Alberich like a dog in heat--on all fours too! The Boulez was not much better with Alberich putting his head up the Rhinemaiden's skirt. The 1990 Levine handled the Rheinmaidens interaction with Alberich in very good taste.
So, at this point I am only considering The Machine as a second DVD Ring set. I was comforted in learing that in 46 performances with the Machine, nobody was killed or seriously injured. I guess if I get too tense watching it I can always chant, "Its only a video. Its only a video." Also, in The Machine, the actors are wearing traditional costumes, which is a significant plus. The only thing holding me back is price. Tell me there are no crude actions like a dog in heat or heads up skirts in The Machine.