It may not sound very exciting, but at public viewings my favourite target is Alpha Centauri! Almost everyone has heard of it (thanks to Lost In Space) and knows it is the nearest star system to ours, but they are absolutely blown away when they see that there are two of them. The first thing they try to do is to pick them out with the naked eye
As your visitors are from the northern hemisphere, they can never see this star anyway.
Of course the planets and all of your other suggested objects would be on my list.