If you already have a sizable epub collection and access to the Amazon store/wireless wanted, then I would recommend a Sony hands down. Especially since it seems you don't want a physical keyboard but do want to take notes. After that, the big difference will be the screen size (which is why I would opt for a 650) and reader size.
I own a Kindle because of access to the Amazon store (and it allows me to easily share books with my non-tech mom who also owns a Kindle). But I prefer the form factor of my Sony and have found that's the read I use most often.
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