I'm shooting a documentary on the HVX with a film-finish required for delivery. I need to shoot 24p for the Film-Out and I don't need the variable speed ability for the doc subject matter. Can anyone clarify the difference between my choices of shooting: 1080P versus 720P versus 720P "Native Mode"?? One option offers 8 minutes/8G while another offer 20 minutes/8G...I need the highest image quality for the film finish, but do I need to shoot in the 60P mode for that? What do I lose by going for the 20 minutes/8G option? Thanks!