On video I like most the one from Orange with Caballé, Vickers and Veasey. It's an old school, traditional production but the singing is spectacular and the outdoor setting works very well.I have to agree, that no Norma on DVD is perfect.
I managed to fall in love with this opera under imperfect circumstances, i.e. watching the recording of Joan Sutherland in Sidney. She was great, but visually, it needed a lot of suspension of disbelief, she looked like grandmother not only to "her children", but possibly even to Pollione. And I did not really like Pollione and Oroveso. But it worked.
However, if you find a really good Norma, let me know.
(I know some people are into recording with Radvanovsky from MET now, but I am still not satisfied. )
On CD, the most outstanding performance is the one from La Scala in 1955, with Callas, Simionato and Del Monaco. I've reviewed it on my blog where I have also reviewed Callas's two studio performances and the 1952 Covent Garden one.
If I have these in my collection I don't really feelI need any others.