Sometimes I ink my stamp with versamark first then into the color that I want to use. Just be sure that if you are making multiples that you clean the stamp before you put it back into the versamark.
The new Stampin' Up! ink pads have worked well for me on solid stamps without having to use versamark first. But if it is black that you are doing there are still problems with the new black smearing so I would not get the black.