Grout color for black and white wall tile mix

My retro rehab project is almost done, ready for grout tomorrow. I'm a little stumped on the grout situation though. As you can see in the pix, the walls are almost completely white (color: ice white) with a bisecting accent line of horizontal black, and a "baseboard" of vertical black subway tiles. I got the brightest unsanded white grout I could find. I started thinking though, that the white grout in the black, especially on the "baseboard" might not look as good; I don't know, I haven't seen any examples of this particular arrangement. I also picked up some charcoal color unsanded as an option.

So what do you think? Use charcoal grout for the black tile and white everywhere else? I'm not really interested in gray, so my choices are either all white, or black for the black, and white for the white.

Your thoughts are appreciated.