What is the best version of Adobe Photoshop?

I was looking at a photo editing software for mac because iPhoto can't do everything I need it to so I was looking at getting Adobe Photoshop but I noticed that they have different versions like Adobe Photoshop Elements 10, Adobe Photoshop Lightroom 4, Adobe Photoshop CS6, and Adobe Photoshop CS6 Extended and I... show more I was looking at a photo editing software for mac because iPhoto can't do everything I need it to so I was looking at getting Adobe Photoshop but I noticed that they have different versions like Adobe Photoshop Elements 10, Adobe Photoshop Lightroom 4, Adobe Photoshop CS6, and Adobe Photoshop CS6 Extended and I was wondering which is the best for someone who mainly just edits family photos and is not a professional. What is the difference between them and is it worth the upgrade from the base to the more advanced versions
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