Have you tried Tomes or uBooks? Tomes is $5 but there is a free version of uBooks. I like the auto-scroll readers, especially for such a small screen as an iPod/iPhone where the pages are so very short.
As for whether or not you want to pay for apps, this is what I do: http://www.geekintheforest.com/ios-apps-free/
I also have a detailed review of Tomes on my site.