I used to shoot my 5Dmk II in a Subal housing. Never had any problems with it. Good solid housing.
Keep an eye out in the Wet Pixel classifieds... I sold my Subal housing there earlier this year. Maybe someone else will post theirs soon.
When I upgraded to the 5Dmk III I ended up getting a Nauticam housing because I really liked the build quality and the ergonomics for shooting video.
It just seemed well thought out and well made.
If you're remotely considering moving up to the 5D mk III before buying a housing, here's an article that talks about the key differences between 5D mk II and 5D mk III for underwater video.