Photoshop

[DaveBrawl]

I am looking to get a copy of photoshop just to play around with and learn how to use and so forth, but I was wondering if anyone can tell me any major differences in the last 3 or 4 versions of it. Like I said I am just looking at picking up something cheap just to play around with. I have been using an old version of Paint Shop Pro for ages and quite honestly it has gotten to be very outdated and doesn't do what I want it to a lot of the time.

On the other hand I have a copy of AutoCad and that's great for drawing things up, but useless for colors. I also have copies of Google Sketchup and 3dsMax laying around here somewhere that a couple of friends gave me that I never put much time into or learned how to really utilize them, so if they would be fine substitutes let me know, because I have never really used Photoshop so I have no real idea what it can or can't do.