Thanks you all for the good advice. I am clear on not using offline files for mastering to Pal.
But just one more question…
I will go with DNx 120 (this being 1080p25 material), wrapped via Clipwrap to a 2TB drive. Then I may or may not ingest to .mxf and just go thought AMA with wrapped DNx Quicktime files until my online? Not sure on this part…Do I need to further ingest these files into Avid after Clipwrapping them?