Personally I think that you should go with pure velocity. Im assuming you want to convey the extreme difficulty of marching in a Finalist World Class corps, and the easiest way to broaden the physical aspect of kids that think football is the most demanding sport would be a corps hauling ***. So Like Last 30 of Cadets 07, or Cavies 06.
One clip I know everyone finds impressive, regardless of what they think of Drum Corps, is the climax at the end of the opener in 96 Phantom if you wanted music.
If you want something that is going to be instantly recognizable go with the opener of BAC 08, that turn and impact is sick.