The E470 is a nice case too... Fits 2 medium full face helmets, and has somewhat 'beefier' connecting tabs than some of the other Givi top cases I looked at. The tops are color matched as well, and replaceable too. Also, the locking mechanism (as stated in one of my previous posts) is metal. You can see pics of mine at the link below.
http://www.600riders.com/forum/fz6-mods/33131-installed-givi-e470-monolock-topcase.html
http://www.600riders.com/forum/fz6-mods/33131-installed-givi-e470-monolock-topcase.html