Just get a Logitech mouse. They work with Macs, you know, and you actually can have more than one (or two) buttons on them.

I forgot to add that Mighty Mouses suck in general. I don't understand that tiny nub of a scroll well, even if it can scroll horizontally. I prefer Microsoft mice because I've abused mine to hell and it still ticks.

Don't use Open Office, use NeoOffice.