Check these guys out http://www.justuscoffee.com/springgarden.aspx
They started as just a roaster but now have a few coffee shops!
They are a very well respected company!
Another one is http://mondragon.ca/ This is a great cafe but less structure, I think.
http://www.organicplanet.coop/ This is a grocery store/deli cafe.
Co-op concept is very big in our area & can be very successful!