I don't think resale is an issue among Civic white, modern steel and Silver. If anything, I'd expect modern steel or silver to get better price than white, as there are many sellers of White at any given point of time and you can negotiate a bit. So don't think about resale too much between Steel and White.
As for the decision between Steel or White, I was also confused between these two. In showroom conditions, Modern Steel indeed looked spectacular. However when I saw that color in sunlight with a bit of dust on it, it looked quite dull. On the other hand I never had been a fan of white but Civic X really looks good in that color - hence the reason you see so many Civic X in white.