I am looking for some opinions please
I have a client that is requesting a 4:3 final product. I know the FS100 will shoot SD but I have yet to try it. I am trying to get an idea of how to produce the best outcome. Shoot 4:3 with the cam, Shoot HD and either crop or provide the final with black bars? Any of this would be acceptable as long as I meet the requested guidelines. Have any of you shot SD with the cam or had to provide this request? Here are the guidelines that I was provided:

• Format: AVI or MOV ONLY (MPEG2 Transport Stream)
• Size: 100MB or less
• Duration: 30 and 60 seconds- THESE RUN TIMES MUST BE EXACT FOR THE VIDEOS TO BE ACCEPTED AND APPROVED.
Video:
• Resolution:
- 720 x 480 @ 29.97fps (NTSC)
- frame aspect ratio: 4:3
- pixel aspect ratio: 0.9
• Upper/Top/Odd field first
• Codec: AVC H.264 (Main Profile 3.0), MPEG-2 (Main Profile @ Main Level), Uncompressed/RAW (except V210/10-bit), DVVIDEO
• Bitrate: At least 6Mbps (CBR).
• Luma should occupy full spectrum between NTSC standard 7.5 IRE black and white level at 100 IRE

To me, it depends on look you are going for. If it is a more cinematic wide screen look needed, you probably go with bars giving a 16:9 or wider screen. If not that important, go with the full 4:3 frame

I would shoot in HD, and down rez in final. Done right, it will look better.