Always best to match your source footage when rendering or exporting all throughout the work-flow. (capturing, rendering, exporting, etc). That's why the ProRes
is good news for HDV, it (theoretically) is the best match for HDV source footage. So if you shot with HDV (even to P2 or drive at 100mbps) there is never a reason to use 10 or 8 bit uncompressed anywhere in the work-flow, which will increase your bitrate by 400% with no gain in quality compared to the original footage.
Same applies to projects shot with DV25 or DV50 SD. Use a codec that matches the source format and stick with it all the way through.
So the current consensus for HDV is use ProRes everywhere in the work-flow.
Uncompressed is really only good for telecine from film, or video that was shot uncompressed
in the first place, meaning at the same data rate that the uncompressed codec gives you, which is about 200mbps (SD) and 400mbps (HD).
Hope this helps,
Paul Buhl