If you want the ultimate camera case that will protect your gear come hell or highwater, there's pretty much only one brand people use and that's Pelican. They're a little on the spendy side, but you get what you pay for. I regularly stand on mine during photoshoots to get a little height (since I don't carry a step ladder all the time and god made me short).
I blogged about modifying a pelican case for use on a bike rack a few months ago and made a Youtube video for Bikecommuters.com about it recently.
Well, the video is now also on the official Pelican site. They're doing a series of user-submitted DIY jobs that show how people use and modify their cases. Check it out here!