The problem with the USB ports on the wired keyboards is that they aren't powered, so things like USB flash drives and other items that depend on power from the USB port will not work.
If you can find the
Apple Wireless Pro Keyboard (the full-sized one before the aluminum version came out) then I highly recommend getting it. I have one and use it a wireless keyboard for a Mac mini, and love it.
And for what it does, I like the wireless mighty mouse, but to each his own. I'd say get it if you like the wired version. My only complaint with the wireless version (I have two) is that there seems to me more play between the top and bottom halves of the mouse, and so the tactile feedback of clicking the mouse isn't quite the same as in the wired version.