If you want a wired Magic Mouse, sorry but apple it trying to go as wireless as possible. There done with wires for the keyboard and mouse. Well not the keyboard...yet
Get the Magic Trackpad it blows the Magic Mouse away especially if you have a large screen. You can move more distance faster and without having to mouse across your desk.
I have a magi. Mouse and mighty mouse (wired) and I can tell you from experience that the magic mouse is by far the much better option. Plus just be lucky you aren't in Australia where the magic mouse and a wireless kb cost 99 each!