Honestly, e-ink e-readers just aren't good for rendering PDFs. None of the e-readers you listed would be good highlighting and reading PDFs. If I had to choose, I would pick the Sony. Sony has a rep for be better with PDFs than other e-ink readers (although that isn't saying much). Plus, you likely won't get support for the PRS-T2 (if you can find one) since Sony has gotten out of the e-reader business (in the US at least).
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