Digital BW, The Print

Jonathan,

While the image needs to be converted to greyscale, it doesnt need to 
be in greyscale mode. You can stay in RGB mode all the way. I've just 
tried it although I usually work with a scanned greyscale mode image.

There are dozens of recipe to convert from color to greyscale. Here's 
one that I sometime use: Convert by adjustment layers. 

http://www.thelightsright.com/DigitalDarkroom/PhotoshopTools.htm

Don't forget to merge all layers before applying Paul's Adjustement 
Printing Curves. The image on the screen will then take on weird 
colors but will make a nice print.

Cheers,
Andre