http://www.bootstrap.org/engelbart/hist_pix/img0001.jpg
here is a link to the actual first mouse made by englebart. it only had one button, but only because the housing couldn't hold more buttons.
i think the one button mouse is perfect for the novice user: my dad still asks me every time before he clicks on anything "is this right?"
i use a four button m$ intellemouse. i had a wireless one, but it was a piece of crap; there was a delay in the response because of the wireless signal conversion. i recently bought a wired version, and i'm happy. except that it feels really cheap.