I don't know what to tell you, all editers I have experiance with go to grey. if I want to do that the only option I have is to do it with my neg scanner set to BW.
That is not to say there is not an editer with the capibility, There may be I just don't know of it.
i either (in photoshop cs3) use the monochrome and adjust the sliders, or use CS3's built in convert to black and white and then adjust with the curves and everything.
If you need more detailed tutorial i will put up later
Try using a gradient map in photoshop and then adjusting curves to taste. That always gives me great black and whites with very little grey. Here is an example: