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Spend the money if you can on Photoshop CS or CS2. The main reason being that Ron Wodowski's upcomming book on the "Zone Processing System" is basically a how to manual for using Photoshop to process images. I have the pre release web downloads and its just awesome and it does not mention Gimp anywhere.....
I am sure other products provide as good or better functions, but the fact is most top level astrophotographers use Photoshop so there is more info on using it for astro processing and more plug ins available than for any other software...)eg Fits plus, Noiseware, Gradient Exterminator etc...)
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