Joan, I just spotted this thread, sorry. I use Photoshop CS2 because it is the only Photoshop program that will open my Canon 20D JPEG/RAW tandem shots. (The Canon comes with its own RAW editing software but I wanted to stick with the Photoshop tools.)
If you already have Photoshop CS you can buy a CS2 upgrade for around $140 (I think).
I don't know why you would need either the CS or the CS2 unless you are shooting RAW format.
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