Originally Posted by HarryT
A PDA (Palm/Pocket PC) will give you much more flexibility than will an iPod Touch and, if you install MobiPocket Reader on it, will allow you to read the same books that you can on your CyBook.
I fully endorse HarryT's suggestion.
IN addition, if you have access to eBay, you can find devices, a bit older, like my Axim X50V or the Axim X51V, or similar from HP (do not remember the series) which also have a VGA display for a comparatively small price, today.
VGA means a very crisp character.