I previously posted some pictures showing the smallest and largest fonts on the Cybook using the built in Verdana font. You really have more flexibility then you need.
https://www.mobileread.com/forums/sho...7&postcount=38
The ability to select 12 different font sizes and download TrueType fonts is a very nice feature on it and lets you customize to suit your needs. You can also "embolden" the text to make if more legible. I've been reading using the 3rd smallest Georgia font and switching to embolden when in poor lighting conditions. If I have good lighting I can turn it off and get an extra 4 lines per page.