Go with optical mice. Yeah, I know it sounds flashy and more expensive - but one of the things I hated most about using mice in my school's lab is they got filled up with so much gunk sometimes the mouse would move very erratically. Unknowing lay-users wouldn't realize the mouse was dirty, and instead think that the erratic movement on the screen was because the computer was too slow. Then they would complain that the computers were too slow. I'm not kidding. So getting optical mice holds a practical aspect.

Oh, and I hardly see the point of running gigabit to the desktop. I can't possibly think of what application would use that much bandwidth on the client side. Unless if you plan to be running an mp3 ftp server, of course... by all means. Otherwise, thats like running a water main to serve a lawn sprinkler.