There's certainly no easy answer for this type of thing, just what a person is used to, I guess. As for having an open casket, I suppose it can give closure to some, but can also be very troubling to others. In my experience, an open casket seems OK with an older person who has died a natural death, but with someone younger that died from an illness or accident it can be very upsetting.
I lost my best friend to cancer eleven years ago. He was only 43. He didn't want any visitors except immediate family over the last few weeks, so the last time I saw him he still looked fairly normal. At the funeral, which was open casket, I didn't even recognize him. He had lost all his hair from the chemo and had lost 80 pounds. I didn't need to see that, but that's what his family wanted, I guess.
I tend to agree with those that say a private viewing, for family or close friends who want to say good-bye, might be best, but that can be very upsetting, too. When my brother died ten years ago, his wife wanted an open casket, and that's fine. I held up pretty well until it came time to close it. That's when the finality of everything hit me. That's when I realized that I would never see him or talk to him again, and I lost it. Looking back, maybe that was better than letting it eat at me slowly like it did my parents. That night we sat around, told stories, and laughed till it hurt. Went through the entire range of emotions that day and, while I was completely exausted when I finally went to bed, I think it did me a lot of good.
When Dad died we had the visitation at the church a couple of hours before the funeral. Been to a couple of other funerals like that, too. Seems to me that's the way to go. Get it over with. It's hard enough on the family the way it is without having them go through the visitation one evening and then getting up the next day and going through it all over again.
Been to quite a few funerals where they have lots of pictures, videos, and story telling. Always liked that, whether I knew the person well or not.
As for me, the wife and I have already bought plots, so it looks like burial is the way we're going to go. As far as the other arrangements, we really haven't talked about it much. We need to do that.