I have a Leica Geosystems laser kit that came in a Pelican case. The case is fantastic, but I sometimes wish the lid was transparent, so I could see if everything's in there at a glance.
Out of curiosity, I checked Pelican's site to see if they make transparent lids. As far as I can tell they don't for their small/medium/large cases, but they do offer transparent lids for their Micro line.
The watertight cases have stainless steel hardware and feature an automatic pressure equalization valve.