Your list of requirements (and non-requirements) and location does seem to point to the 650.
I have never owned or used a Kindle, so I can't comment on them, but I would say that you shouldn't be tempted to economise and buy a Sony 600 instead. I have both and you really wouldn't be happy with the screen.
I think fjtorres point about pdf's is pretty valid as well. You mention 'documents' - if these are pdf's, and you're going to be reading them a lot, then you should probably take a close look at the 650 before buying to make sure it handles them to your satisfaction.
Just my 2 pence worth - hope it's of use.
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