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I'm looking for info on mixing for film

I'm working with a tight group of film makers, all local, but a very dedicated bunch. I have been searching everywhere for info on mixing dialogue, foley, and music and happened upon the -20DBFS pink noise to 85 RMS mix standard. For anyone familiar with this, I think I get it, yet I wonder if I really do.

which one you expert suggest as reference headphone for mixing from below?

Sennheiser 280 HD pro
Sennheiser 380 HD pro
Audio-Technica ATH m50
KRK KNS 8400

internet has mixed review for all, though i was planning to get Sennheiser 380 HD pro, but still need the expertise advice to pick the right one.
thanks.