I understand the eInk factor isn't too important, you just want to have something small to read on anywhere. Additionally, eInk screens with their glass substrate tend to break easily when bent or dropped, and replacement costs about the same as the new one.
Perhaps UMPC computer would do the same thing for you?
http://en.wikipedia.org/wiki/Umpc
It's usually small and light, has WiFi and you can connect to the Net in most places where there are WiFi hotspots, and read fanfiction just as if you read it on PC. And its LCD screen won't break so easily.