You'll need it if you decide to try sculpting in Blender. I have an Intuos 4 Blue Tooth Tablet, but for most of my modeling I use my Logitech Trackman, unless I want something VERY organic.

mo·nop·o·ly  [muh-nop-uh-lee]
noun, plural mo·nop·o·lies.
1. exclusive control of a commodity or service in a particular market,
or a control that makes possible the manipulation of prices