Hi Alex,
Very sorry to hear of your unfortunate accident

.
As cbell says, Bookeen will replace the screen for €120, so that would certainly be your least expensive option. From what I've read, it's generally a pretty rapid service, too.
If you do go ahead with the new one, you'll need to wait until you get it, and then log on to the web site of the vendors you've bought your books from, add the PID of your new CyBook, and re-download the file.