OD Green, Foliage green, Khaki in that order.
Question really is, is hiding while you hike a priority?
If you're just hiking, and not trying to blend in, just buy the one that you like the looks of best. Personally, I DON'T like the screaming bright blues, reds, and oranges on most non-military type packs. Not that I'm hiding or blending, but it just looks so out of place in nature. Of course, if you're lost or injured and need people to find you, that's an asset. . .
I also don't care what people think of my pack color. If they think OD is military just because of the color, then bully for them.