I keep most of my video in its native form on an HTPC but I take it that when I need to Burn a DVD from HDV footage that the "best" template settings would be "Top Field First".

The other settings I am using is:
- MPEG Video 8MPS VBR
- MPEG Audio 384KBS (I'n in PAL land so MPEG is supported by our DVD Players)

Thanks
Nathan