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Well, Im with Chris. Nothing else compares with PS, and if yr serious about astro imaging, you simply must have it, period. I have spent FAR more time learning how to use it than the rig hardware, and FAR more time in processing images than taking them. Its the one tool that really can turn sows ears into silk purses. The cheaper your rig, the more you need PS, the more you need to learn it insideout and the more time you spend using it.
As far as which version, CS2 is fine 16 bit processing is important (but Russel Croman uses an 8 bit version, v6 or something, go figure?, although he obviously streches in astro apps 1st). Later versions just have features for astro that save time, nice, but not essentiall.
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