When no video is needed, get the 500D.
Or if 720p @ 30fps (not 29.97) for short segments is your bag - granted it's not great in any but the best light, but it gets the job done. The whole bumping up the framerate to 60Hz (59.94 but who's counting right) and apparently not leaving in a 30fps option baffles me, especially when clip length is so limited.
A little more about frame rates.
See see http://www.adobe.com/devnet/flash/learning_guide/video/part06.html
NTSC video is usually said to run at approximately 30 fps, and PAL runs at 25 fps. To be technically accurate, NTSC video runs at 29.97 fps.
The reason for the odd frame rate dates back to the transition from black and white television to color TV signals, where the 29.97 fps rate was chosen to ensure backwards compatibility with existing television sets.