One thing that I also would consider is the advice of many marketers. I have found that they say underpricing your ebook is worse than overpricing. That if you under price people will question the value of your ebook. I find this advice terrible. I love seeing 99 cent ebooks, I don't think that it means they'll have low quality, and I can always get a sample first. I think that 99 cents for an ebook is a great deal. I would rather buy 25 99 cent ebooks than a lot less high-priced ebooks.
Before you launch your ebook, have a friend read your book and ask them their opinions on pricing. Take these thoughts into consideration when pricing your next ebook.