B&N Nook and Kobo both support Adobe DRM epub files, which is what you have if you bought your books from Sony. Both have dedicated eReading devices as well as apps you can use on your iPad. From what I've read I don't think you can sideload content from other stores onto the Nook app, but you can on the Kobo app. You can, however, use Bluefire to read on your iPad as others have mentioned.
You have freedom of choice now because you have epub files. Personally, I wouldn't trade that to be locked in to Amazon with your future ebook purchases.
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