I have a Pelican 1510 which holds the HVX, charger, 4 batteries, 4 mini-dv, 4 P2 Cards, remote, SD card and a cutout for the silicon gel. Holds all the essentials so that I have on hand what I need.
We have 3 HVX200's and the case we chose is Thermodyne that's made for the HVX. It is by far the best case I've seen. We have pelican case's also but I don't like the diced foam and after some time it starts to fall apart. The Thermodyne has plenty of space for accessories and it's form fitted with castors and telescoping handle.
I might be wrong on this one, but i think the only air legal is the 1510 from pelican(which i bhrought in yesterday another time succesfully..), but also this will change at least in europe, as they plan to reduce the maximum size soon, guess this summer..keep that in mind, dont think that this will be different in the states...!