
I'm sufficiently content with my off the shelf reader, but If you can't find the reader with the perfect set of characteristics for you, here's your answer. Buy an eink screen and kit from eink for a mere $3K. Use it to build your own reader. Make your own case, include your own required features, and you're in business.
http://blog.wired.com/gadgets/2009/0...&ie=ISO-8859-1
http://www.eink.com/kits/index.html