I'm using the wired Apple keyboard with num pad with my Mini. I did consider the wireless one, but I do feel like the keyboard at least should have a wired connection to its computer. Of course, this may not be feasible for any application, but as my Mini is a normal desktop computer, I don't see any point in using a wireless keyboard.
However, the trackpad is, of course, wireless. In fact, I'm so used to it now that using a mouse has become unusual!