All the ways you listed are effective, and various teams have won Championship Chairman's doing their presentations in each of those ways. The important thing to remember is to do what is right for your team. Our team does a more traditional interview, but we also use fun props to engage the judges. Look at how you want to represent your team in the room, and just do what fits that representation.
As far as what to put in the presentation, you'll probably want to include impact statements from each of the presenters. Impact statements are basically personal statements about how FIRST and your team has changed your goals/future/outlook/life. The presentation is basically a change to make your teams accomplishments personal and to empasis the important aspects of your Chairman's submission, so this is usually the things that make your team unique.
I know this is kind of obscure, but I hope it helps. If you need any more help or have any more questions, feel free to PM me or email me at
kinney.anderson@gmail.com. I would really love to help you guys out!