I am taking a portrait photography class. Everyone will be learning skin smoothing and eye pop actions and more in Photoshop. I see there are sooo many different Photoshop choices on the market today. Where is a good place for a beginning photoshop user to start? (which version?) 7.0 is probably better than 5.0, why CS2 and CS3 are very expensive, is it worth it? I mean can you do things in these that you can't do in 7.0, etc. Thanks for any advice.