Petcurean is the company that makes Go! ... a very good, privately owned company. I've never fed any of their foods, but I wouldn't hesitate to try them if I was looking for a new food. Petcurean also makes other lines besides Go! that are worth looking into.
I've also heard good things about a company called First Mate, I believe forum member Sabis mom may have experience with the brand.
I fed Orijen, which is made by Champion Pet Foods, for years and had no issues with it, both my dogs did very well on it. Acana is also made by Champion, and is very good food with a wide variety of formulas. Champion is an excellent company, but there have been rumors that Purina is looking to buy them out, so if you decide to go with one of their foods, be aware of that and keep an eye out for an acquisition and potential cheapening of the product.
Don't have much other experience with Canadian brands, so hope that helps, and good luck.
Omen v Wolfstraum
Jasmine Katie v Doolanshaus