I did wind up getting a Kindle and I love it. The light weight and battery life were really big selling points for me, and are what made me choose it.

The sorting features work well enough for me. I just wanted to make sure that it did have some sorting features.

The web isn't as nimble as an iPhone, but it still does what I want. I'm able to check the AO3 and LJ to read from the Kindle. Maybe Amazon will develop it further if people express an interest in it.

Thanks for commenting! :)