Ted,
I use slightly different textures or color settings for the doors, face frames, box parts, and moldings. This allows for a little definition of each of these parts so that they don't just melt together. Michael is correct about playing with the shine settings. Id you Have multiple textures you can set different shines for each of them which also provides more definition of each part. Also drop light fixtures down low which will light up as well as ceiling fixtures lighting down. With black avoid placing lighting in the cabinet or behind the cabinets as this will cast shadows on the front of the cabinets making the part definition face.
Kerry
My thinking on this is never use pure black or white.
Think of it like this. Black is for shadows and white is for light.
I have made off white cabinets render fairly well. I tried some black appliances not long ago in white cabinets and could not get it to work. I ended up changing the appliances to another color.