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I can't recommend Matlab for the casual user ($8-10k); my copy was purchased by the company I work for. The image processing toolbox does have some nice filtering stuff, but it's not really oriented towards astrophotography. I'm developing a some prestack processing stuff in C based on my Matlab prototypes. I hope to improve on the sqrt(n) reduction in random noise achieved by simple summing. The 2-D median filter found in some software only does a simple n x n moving median filter (n = 3,5, ...). There is a line pattern sensitive median filter which tends remove outliers nicely without reducing bandwidth and blurring structure as much.
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