I mostly agree with East Hill, bike stuff is gonna get scratched and dinged, ya gotta deal with it. But... gravel mud puddles are my favorite things to bike over, so I may have a different point of view.

Unless you have a computer/GPS with a fancy screen that shows maps and pkays DVDs and washes your bike clothes. Then I could see it.

Maybe something like this, but cut down to fit a computer:


You'd need to rig some sort of handlebar clip, of course.