I bought an IREX DR800 for just such a purpose. It seems the ideal compromise and with the updates to the firmware (zooming rather than just reflowing, and annotations on pdf) it is becoming more and more useful. The big drawback is the cost - more expensive than most, but if you need a tool for a particular job my thinking was you might as well get the best tool you can rather than save 100 euros and get a tool that doesn't really do what you want it to.
Good luck with your search!
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