Welcome Hannah. BeBook is a very good choice. Once you have had some experience with it, you might want to investigate the OpenInkPot firmware. Check out the sub-forum and WIKI explanations here on MobileRead and also their web site,
http://openinkpot.org/. OpenInkPot works wonderfully on the BeBook (AKA Hanlin V3 & Astak EZ Reader). It has great features and is very stable. In my experience it seems to use less battery than the original Firmware.