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All e-readers are pretty much "locked-in" to a format (there are some that read both .epub and .mobi (BeBook Pure, Kobo Touch) but only DRM free mobi). Yes there are more choice of shops to buy epubs from, but on the other hand, the best single shop with the widest variety and competitive prices is Amazon and they don't sell anything other than mobi/azw format. Plus, there are some other shops that sell mobi formats and not just epubs, like booksonboard & smashwords for example. So it's subjective really, 'locked in', or 'locked out'?
Also, you can download just as many Kindle format books from Gutenberg as you can .epub books.
That said, as far as the PRS-T1 goes, it's possibly best suited for you, as if you check out the Sony forum here, I'm pretty sure you can root the T1 and run apps on it, so you'd possibly be able to read Kindle books using the android app.
However, the best option (if you are willing to do so), is to learn to strip the DRM from your ebooks. It's fairly quick and simple to strip the DRM and convert the books to your preferred format, and then you can simply buy the ereader of your choice.
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