what is the best HD format to shoot for 4x3 NTSC SD playback on TV?
I'm shooting a commercial for a car dealership.
Also what scene file should i start with?
If you're talking about shooting with the HVX, then I would shoot it in DVCPro50.
You'll get the benefits of 4:2:2 color sampling with half of the compression of DV, and nearly a third the compression of DVCProHD.