Find out which version is right for you. And what is that version really holds. Photoshop has been around from a decade now and the brilliance of it has never fallen a bit.
Few days back we wrote a article giving the Photoshop CS5 Keyboard Shortcuts, as this was for CS5, the newer version has almost same keyboard shortcuts and you will be able to make-out pretty easily how these shortcuts can save a lot of your time.