14 is not possible. I used to work for a company that dealt in translation software, and specialized dictionaries were required for each specialized type of document. The translation still was not perfect. The software would also be extremely expensive, if it existed.
Most ereaders can only read one format, either ePub or mobi, not both. Although I heard of one epub reader that could supposedly read mobi, but I heard it did not do it well. A tablet can do it, of course, using different apps for both.
Only a tablet can read both B&N and Amazon books.
It kind of sounds like, otherwise, that you want an old Kindle Touch, which had audio capability, as the new ones do not. Only an Amazon reader is going to be able to read Amazon books (aside from the Amazon apps, of course).
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