I really like calibre, and if worse comes to worse, I will use it to convert. But I found the conversion often messes up some formatting (titles, page numbers, tables, pictures, etc). It tends to be readable, but if the author has it in the correct format, all the better. I am willing to wait a week to start.
Jeff - I would be willing to "beta test" (or whatever you call it in the writing world) your epub version. Basically, find any formatting errors as they appear on different devices/software (I have a Motorola Droid 3, Calibre's native reader, Adobe Digital Editions, and an original Nook). I have fixed up non-DRM epubs before, so I do understand the internal format (Basically a zipped folder full of HTML pages. You can even change the extension to .ZIP and open it up. If you know HTML, editing it is a breeze.)