Can't recommend a hard-shell case, but I've been recommended a soft-shell one and I've just ordered one, it was shipped to me Friday.
The motives for recommendation by two different people were:
1) Hardshell = extremely difficult to carry by yourself in many situations, like European airports with sometimes hard to find elevators, train stations, etc. Very heavy.
2) In airplanes cargo, hardshell boxes go at the bottom, bags at the top or in special compartments;
3) Once you actually arrive to your destination, you need to figure out what to do with the box, whereas the bag takes less room;
4) A good quality bag will totally protect your bike anyway.
I'm getting this:
http://www.cdisports.com/carrying_cases.htm (the black one at 219 CDN$).
The friend who recommended this to me, a sponsored Ironman triathlete who travelled quite a bit with a very similar bag, told me he loved it. He bought pool noodles from the dollar store and split them apart for added padding. All he does is take off the wheel, unscrew the rear derailleur, and probably take off the pedals, plus turning the handlebars of course.
Sorry I can't help more about the hard cases. (Although they have some on that page above.)
Good luck!