I attended the Atlanta Grenadier Experience yesterday and after seeing all the colors, I remained committed to a solid color and thought the silver was the best looking metallic. It really does look like it has shades of blue in there. Beautiful.
As for the solids, my suspicion I would find the Britannia Blue too dark for my taste was confirmed. It was an overcast day, and I just found it to be so dark it made the cool black bits near invisible. My top picks going in were Magic Mushroom, Scottish White, and Sela Green in that order. The Magic Mushroom, of course, captures the military feel well and I only noticed an ever so slight pink hue when viewing the color from a distance. Ultimately though, I liked the White and Green better. The creaminess of the White is classy as hell and it really makes all the black bits pop - the look of checker plating is killer. The Green also looks great, though it is still a shade darker than I would find ideal (what's up with me and my dislike for dark colors?). I think I will go with Scottish White at the end of the day - best for my home base climate (Deep South), will not show trail scars as badly, and is the standard color, which will allow me to put that other color upcharge cost towards accessories.