It doesn't really matter, a few colors or full color, it's all going to be the same unless it's set up as a spot color and printed on a press vs. digital. In any case, with only 100, it won't matter much in any direction - it will be about .50 per 8.5x11 for a full color digital print on each side from your local Kinkos, Staples or Sir Speedy, so $1 per 2 sided page.