Originally Posted by holymadness
Hard to say. Most 'premium' apps for iPhone are being priced at $1.99-$2.99. Since yours is an iPad first app, you could probably charge $2.99-$3.99. I read so much on my iPhone that I'd gladly pay that much, but I doubt I am typical.
You may find it is more interesting to offer your app for free with an optional in-app purchase ($1.99, let's say) that unlocks certain non-essential but useful features such as: summary creation, deep view, additional themes, increased number of books in library (i.e. maximum of 5-10 titles in your library for unpaid version, unlimited for paid). That approach is having a lot of success lately.
The "lite" version approach should work. That way people can freely evaluate the app, without being forced to buy something they might not like. Then if you like it, purchase the unlock in app.
I like it. I know of several apps I have purchased under that approach.