In general, I think e-readers are good. I had a Sony Reader for over a year, until it went on the fritz and I got a Kobo to replace it. The new one has a removable memory card, a quilted back and more easily legible text sizes.
If you go to Google Books and do a search for "Orthodox," and check "full" for the book capacity, you may see some interesting results. There are a number of older books about the Orthodox Church, from the Isabel Hopgood service book, to one or two by Sebastian Dabovich, to some Coptic books by Tadrous Malaty; they will usually be in epub or pdf, for free download, and a few can't be downloaded but can at least be bookmarked. You may know about this already, or not, I just thought I'd mention it, because it's a nice resource to have, especially if you like e-readers.