something else...unless you plan on reading large PDF's with lots of graphics, image files or anything else that are consistently in the 20MB range or higher, don't let the amount of memory worry you. Even and ereader device with just 521MB of user memory can hold somewhere around 1000 books. By today's file size standards, ebooks are teeny-tiny in size with few being near 1MB and most being in the 200KB-400KB range.
Also if you are going to be away from power for extended periods (talking a week or more) and plan on using the device more than a couple hrs/day, the readers which use AA batteries might be worth your consideration or at least a device with a user replaceable battery. Though these days flying with extra batteries can be a whole can-o-worms in itself. But my Kindle 2 International (the only 6" reader they sell now) will last me a couple weeks if I read a couple hours a day the whole time and do not use the wireless.
Most readers are in the 1-2 week range depending on how you read and the quality of the battery used as well as the quality of the devies power management (cheap readers can sometimes cut-corners here).
but if you are going to be near power at least once/week or can carry a laptop that can charge your reader via USB, pretty much any reader either an e-ink type display will do ya fine. After that it gets complicated decided which "features" matter to you most. Have fun!
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