What color should your interior doors be?

I am doing a little winter upgrading of my "white" house to color. My walls are variations of a "mustard brown" with texture. My woodwork is painted a pale gray called cirrus gray, like the clouds. Now my kitchen door that goes out to the porch, and my patio doors with one stationary door still have the factory primer on them. I'm pretty sure they should not be the colors of the walls, because they are flat, and doors need to be washed, so.......should they be the semi-gloss cirrus gray of the woodwork, or another color (like white) completely??

Thanks, Legit