You already have Calibre. I believe it can do bulk conversions so you could tell it to do so while you sleep or something. You could also have it convert each book one at a time as you load the book you want to read. That takes seconds. No real need to convert all of them at once. Just pick the reader that has the best screen and user interface for you and don't worry about conversion. IF you have some books that display best as PDF (lots of pictures or charts) a tablet really works better for those, especially a tablet with a larger screen. Can you afford both?
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