I don't know if union vs non union is good for nsg school - that was really something I didn't start to think about until I was out of school. Physician assisted suicide is a good one - there was a movie in the 80s (I think called "Whose Life is it Anyway") that dealt w this issue. In school, we had to do pretty much the same thing. I would stay away from the general hot button issues like abortion, because those will cause more of a fight - at least they did in my class.
To do adn vs bsn, you have to have a diverse group of ppl....and a BSN group isn't quite diverse in the educational aspect

Plan B, availability of health care to all, should McD's and other fast food restaurants be held accountable, etc etc etc.
Good luck!