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Pick one. EASY!
Black.
sage sucks, I really like the pink and the lime green in Halo 2.
black is the color of evilP.S. and skill
Black or gray. Gray for one like Hang 'em High or Sidewinder, Black for Blood Gulch or anything else.
Blue/cobalt
I go for the genuine Master Chief Sage.
BLACK
Depends what MP level I'm playing on.
I find that cobalt blends in the best with more levels than any other color, so that's what I use. It's especially good on sidewinder.