Although I've never seen the NX-70's video I'd agree with the "not great" quality of the video on the NZ. However, I can say that I've taken video then popped it into a powerpoint presentation. It's a powerful tool.
Bernie, to answer your question about taking photos of x-rays. If you check out my site under "What is your diagnosis" as well as under "ER photos" you'll see pictures of x-rays. I took those photos directly from a monitor and they came out great. I've also taken numerous photos from the hard copy films and they too come out with a nice resolution.
I can email you some of the x-ray pics if you'd like.