Hi Bart,
Agreed about compression on top of compression, but since you are starting out with a lower data rate (50 Mbit/s) anyway, there's very little hurt - if any - in using DNx185 (185 Mbit/s), or even DNx120 (120 Mbit/s). I know that MPEG Long-GOP is different from DNxHD, but we're talking more than double or triple the data rate). On top of that, the DNx codec was developed for multi-generation use. It seems to hold up more than well.
Best way to check is if you (or your grading house) can tell any difference when going through 1:1 (829 Mbit/s) or through 185. I'm betting they won't be able to tell. There have been multiple statements from folks that had quit using 1:1 because they just could not tell the difference with 185.
Using the x-variant of the resolutions makes no sense at all, as you will just be adding two empty bits to your 8-bit picture. It has no consequence other that eating more of your storage.
> ; to me it seems like compression over compression...
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