If you can find a Sony 505, snap it up. The screen is the same as the 300's, but a bit bigger, and it's been thoroughly hacked so you can replace the firmware with one that allows a lot of customisation (look at the thread on the PRS+ customiser).
If there were just one reader that had software which would do full justification with hyphenation, then that would be an immediate first choice. Unfortunately none of them do - you'd think any manufacturer looking to differentiate their product would pick up on this (big hint to any of them reading this).
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