Hi Dan!
Oh - I love to dance, so you hit the right note with me LOL!
Seriously tho - If you are aiming for easy printing, then you will want to go with the pdf format. However, allowing printing doesn't help your concerns regarding someone scanning a printented document into a pdf program (although, doing that is a pain and often not worth it).
Here's an idea for you - don't allow printing of your bokk (okay, that will be broken but not by the majority of your cusomers) and offer two versions - an ebook (non printable and formatted to make printing a nightmare) and then, for those customers who desore it, a printed copy (I know a true POD company who's prices a re extremely reasonable and will even send out your book as ordered - as an added bonus, you can be listed on Amazon by using them).
Let me know what you think,
Tam