I have never been a fan of Wagner's operas. Too heavy, dark, and slow. But I recently watched the first hour or so of the Bayreuth (Barenboim) Ring on blu-ray. And it made me reconsider my view of Wagner to the point where I am considering buying one of the Ring cycles on blu-ray and hosting a showing for friends and their families (including kids aged 11 and up) who have never seen the cycle but who are also curious about it. The Bayreuth Ring seemed fine, but perhaps a bit dated in that it did not seem as vibrant (either in audio or visuals) as some other more recent opera blu-rays I've seen. The opening also seemed a bit stark, at least until the arrival of the giants. The 2012 Met version sounds from reviews like a good traditional choice, but the 2010 Spanish version sounds from other reviews like it may make good use of more modern special effects and stagecraft, which might make it more appealing to a mixed audience.
Has anyone seen these various productions such that they would be comfortable making any recommendation of the best one to invest in if I am only buying one (and planning to show it to people to convince them that Wagner can be their friend)? I am leaning toward the Met version, but that's sight unseen so any advice would be appreciated.