If there are any other Canadian mechanical keyboards available please feel free to post
Unfortunately, there are not too many mechanical keyboards available in Canada. Even the Matias Tactile Pro which is made from a Canadian company is difficult to find in Canada. Now is a good time to buy from USA because of the Canadian dollar being close to, if not on, par with the American dollar. I bought most of my keyboards at a time when the exchange was much worse.
I don't know much about the Rosewill since I have not had one. I can talk about the Das and the Filco. As far as the Das Model S is concerned, I have not noticed much dust gathering in the two weeks I've had mine. There is some but not much. Finger print is not a problem either (in my case) since I don't rest my wrists when I type. The only place where there is some finger print is around the arrow keys. Once again, this is not a big deal in my opinion. My Filco will gather some dust around the keys too.
I think people forget that much of the dust on the keyboards is probably from dead skin.
Good luck in your search for a mechanical keyboard. I know it's not easy when you are in Canada.