Pre-Order Incentive Question

Hey people, I have a question: If I were to offer an incentive for pre-ordering Calling Dr. Laura, which of these things would you want:

A dollar off a 2013 calendar?

A percentage code off my etsy site?

A hand signed/ drawn book plate?

I think the book plate thing makes a lot of sense, but you'd have to send me a copy of your pre-order receipt and a Self Addressed Stamped Envelope.
In the spirit of the book and transparency, this book plate idea is something lifted directly from Dr. Laura herself. (!!!)
Anyway, please comment and let me know what seems like the best of these options.
Note: the book plate will NOT look like the handsome dachshund one above.
xoxo
n.g.