The FIX and Ikelite P&S housings are only rated to 200' (60m), so if you're going to 280, you're going to have a hard time finding something.
The smallest, most compact housing I've ever seen is the FIX housing for the S90, but again, if you need more than 200' that's not going to work, either.
The Patima housings are rated for deeper than the FIX housings, so that might be an option. They make housings for the G10 and G11 is coming soon, I think. Patima G10 rating is 80m working (262') or 120m max (I think that means you can use it/push buttons down to 80m, but you can take it deeper (120m) but don't push buttons that deep.
I do suddenly recall reading about a factory-upgrade option for the Fix housings, that allows them to be taken down to 100m. I'd contact Ryan at Reef, or someone at Backscatter, and see if they know when the upgraded versions will be available, and if they'll be available for the camera you'd prefer (S90 or G10/11)
Otherwise, the Panasonic LX3 in the 10bar housing seems like a decent option. Note, again, however, that the "recommended working pressure" is only 60m.