Is your book fiction or non-fiction? What is making the layout complicated? Could it be simplified? I agree that I don't know if your problem would be solved simply by switching formats.
That said, I am aware of one company that specifically does audiobooks, h
ttp://audiobookman.com These are basically done much like a recording studio would do a CD. There are also plenty of info-marketers that record their own MP3/CDs with just decent home recording equipment. All depends on what your audience would be happy with.
Hope that helps.