This is just a quick question, I'm converting TO *.DV and unlike with when converting to MPEG-4 or AVI you have very little options.
This is what you get with MPEG-4 and what I would choose:
This is what you get with DV - What are the highest resolution settings to choose?
You choose from:
Compression: "DV (DV25)", "DVCPRO25" and "DVCPRO50"
Standard: "PAL, 1720 x 576, 25 fps" and "NTSC, 720 x 480, 29.97 fps"
This is what you get with MPEG-4 and what I would choose:

This is what you get with DV - What are the highest resolution settings to choose?

You choose from:
Compression: "DV (DV25)", "DVCPRO25" and "DVCPRO50"
Standard: "PAL, 1720 x 576, 25 fps" and "NTSC, 720 x 480, 29.97 fps"