Most of my research for my boat purchase was focused on the inflatables & RIBs in the 4 - 5 m range. I'm definitely not as knowledgable as most other members here are about RIBs in the length range you are looking for. There are a handful of members here from BC who are very familiar with the BC based manufacturers of the larger RIBs. Not to put him on the spot, but one fellow that comes to mind is Ocean Eco (he operates a whale watching tour operation out of Cowichan Bay). I have been to the Polaris plant a couple of times, and they are a great bunch who make excellent boats. I have also ridden in a +7 m Titan while whale watching in Tofino, and that was an extremely well built, very heavy duty boat. In addition to Polaris, Titan & Zodiac Hurricane, a couple of other BC based RIB manufacturers that I can think of are Liquid Metal Marine & Hy-Seas.
Here are the Canadian RIB manufacturers that are listed in the http://rib.net/directory/
GRAND MARINE INTERNATIONAL INC
Manta Inflatable Boats
Polaris Inflatable Boats (Canada) Ltd.
Titan Inflatables Ltd.