I don't know exactly how long it is, but it's too short to make it from my keyboard tray to the back of my G5. However, USB cable extenders are pretty cheap. I stole one from my Powermate and just moved the powermate closer to the tower. On the other hand, Bluetooth is a handy thing to have, and since you can't install it internally later, it might be best to go ahead and get the iBook with built-in Bluetooth.
Oh, and I believe the plural is "mouses" when dealing with peripherals
