Roof Cargo Boxes - which ones fit?

As we all know, our 2s are incredibly tiny inside. More and more I find myself driving 2-3 people with bikes, camping gear, ski gear, etc. and trying to pack it all in is real-life tetris. So, I've got the factory roof rails. Now, anybody here tried a cargo box? I tried a Yakima Rocketbox 11 from another car I had and the clamps weren't meant to sit so close together and it was a poor fit. Also, the hatch clearance was an issue.

So, what have you got? Pics? Dimensions?

Possible candidates:

Inno Ridge Box - 9 cu.ft. - I like the low profile design:




Yakima RocketBox Pro 12 - 12 cu.ft. :




Thule Sidekick - 8 cu.ft. - kind of ugly/tall profile?

That Thule is ugly. Best of luck with whichever you choose. During the summer I keep my bike in the back, so that's my excuse for not driving other people.