Digital BW, The Print

Have been a long time lurker. Just wanted to suggest that, although 
it's more expensive then the previously suggested options, Picture 
Window Pro might strike the perfect balence between inexpensive and 
powerful (Full support for 48-bit color/16-bit B&W files):

Picture Window Pro -- $89.95 (30-day trial version free download)
Picture Window -- $49.95

Plus there's a very helpful online introduction at:

http://www.normankoren.com/PWP_intro.html

Just my 2 cents,
Jason.