Depending on how old your mac is, definitely go Aperture or Lightroom. Aperture uses the GPU for rendering so you'd need a more modern mac for better performance. Don't waste money on Adobe Elements. Once you feel like you need something more powerful, there won't be any use for it anymore. With Aperture or Lightroom, they will always be an important part of your workflow. Photoshop is a must at some point, but if you are just starting out, you can do a lot with the first 2 apps mentioned.
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