I don't look too much at Google keywords to determine if I should reg a .ca, or go after it in TBR. I search the term on google to see what people are using it for, and what kind of ads show up. I check other extensions to see if they are taken. I look at if I or someone else could build a site easily on the name. I use a bit of 'gut feel'. I also check if I have a site put up that is related, because I might just 'point' the name to my already developped page - for example, if I build a webpage for goodcoffee.ca, I might pick up coffeeworld.ca in the TBR and just point the name to that page.
I recently picked up gamespace in the TBR. Why? It's taken in many extensions, gaming related (popular subject), sounds good, generic (NA owns the .net), and I can point it to a webpage I already have built. I won't make a fortune with this name, but to me it's worth much more than what I paid ($xx).