Phil,
Photoshop Elements 2 would serve you well, as a starter.
Picture Window Pro ($90), written by Jonathan Sachs (author of Lotus 1,2,3), provides a powerful image editor geared for photographers. Few know about the program, but it rivals Photoshop in the features offered for photographers. It does not pretend to be a graphic arts software program, such as Photoshop. Curves, histograms and masks are integral parts of the program. The program NEVER alters your starting image!
The PS plug-in, Color Mechanic, is an offshoot of this program.
Normal Koren has a nice introduction to Picture Window Pro.
Picture Windwo Pro can be found at the website Digital Light and Color.
The new version of PWP 3.5 will come out in August and will have built-in features rivaling NeatImage and QImage, supposedly.
Jonathan Sachs writes wonderful software programs, logically constructed. It's lean and mean.
The extensive manual and white papers on numerous topics taught me more about image editing than the multiple books I read on the full-blown Photoshop program as well as Photoshop Elements.
It is not, however, idiot-proof, as is Photoshop Elements.
Good Luck with whatever you decide upon.