I have a black notebook, and I am using the Sakura Gelly Roll Silver Shadow pens and the Pentel Hybrid Dual Metallic pens. Both show really well on the black paper, but beware that the effect of the Silver Shadow pens is a lot more subtle than I thought it would be. The writing is mostly silver with a faint hint of the color the pen is supposed to be.

If you want white, the Uni Ball Signo white pens are considered the most opaque; I find them to write more opaquely than the Sakura Gelly Roll white pens.