I have already posted this in similar threads and I don't want to sound like a cheerleader... but I would recommend the SONY PRS900.
I am a PhD student in Finance. I read a lot of PDFs similar to yours from SSRN and JSTOR.
The PRS900 works well for those - including taking and exporting annotations.
At times, I use Briss to remove margins as well, but most of the time it isn't necessary.
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