Anyone install a reverse/backup sensor?

I have installed a roll pan on my sportside. With out a bumper my fiberglass corners are now exposed when I backup. I am thinking about installing a sensor system to let me know the distance behind me. I don't want to spend to much but something that will keep me from visiting my bodyman any time in the future. Something to keep from doing a Homer. :dupe:

Does anyone have experiance with self installed reverse/backup systems that don't cost to much, work well and look good? Does that sound like a contradiction?