Originally Posted by DSpider
Seems that nobody mentioned this yet; plain text (.txt) is a bad idea for an e-book. If you plan on manually re-adding bolds and italics yourself, that's a VERY bad idea. It takes a significant amount of mental effort to visually "scan" every paragraph for italics and other styles, and you're bound to miss a few of them throughout the entire book.
Text(txt) to Epub sample:
Source:The Rest Hollow Mystery.txt
Epub: The Rest Hollow Mystery.epub