A Fun Problem to Have

I am due some writing moneys from pieces coming out in print this fall (yay!). The fun problem is this:

It makes sense to roll the writing money back into writing, and thus help offset the amount for taxes. That much is a given. I could go on a mad spree in a bookstore, of course. Who couldn't? But it makes more sense to buy something longer lasting. Like: a kindle? an electronic notepad? an iphone with e-reader? all of them?!

If you had around 700 to spend on "writing support tools", what would you do with it?