Actually, SUeMichele:
Most of the people reading your post ARE programmers or coders, and, here's a shock: people don't want to PAY for programs to make eBooks. There are authors over on the KDP forums bitching about how Amazon doesn't "fix" their programs so that their FREE tools don't magically fix crappily-coded Word files to make magically-beautiful eBooks.
Calibre and Sigil are both popular primarily because they are FREE. Jutoh struggles, because it costs a whopping $40, or something like that, but will convert almost anything TO almost anything, and operates like Word. Calibre WILL do everything you've asked, but you have to learn how to use it. Atlantis, ditto. Scrivener will make very passable ePUBs and MOBI's.
Sigil isn't a Word Processor. It's not an authorial tool. It's an ePUB editing and creation program for people who know how to use xhtml, css and regex. Everyone here has given you perfectly solid leads on finding programs that match up with your needs--and it isn't Sigil, as near as I can tell.
HTH.
Hitch
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