You could possibly markup all text, copy for wordprocessing and save it in a more usable format. I'm using PDFs a lot and have the same issues. Just seems that I don't bother that much. As long as I know where a chapter starts and ends and the font is readable, I'm fine. But for my next book, I'll give conversion a try to see if it maybe pleases more
I would love the crop function on the 600!!!