Hi vantom,
The first place I would start with your mattress research is post #1 here which includes the basic information, steps, and guidelines you will need to make the best possible choices. It will also help you avoid the worst choices such as major brands, mattresses which include lower quality materials, or mattresses where you aren’t able to find out the quality of all the layers and materials in the mattress. None of the mattresses you linked show any quality specs and in cases like this it’s usually wise (and mostly accurate) to assume that the materials are on the low end of the quality scale. I would avoid all of the choices you linked in other words.
I would also focus much more on the quality of the materials in a mattress than I would on the name of the manufacturer. a mattress is only as good as its construction and the quality of the materials inside it regardless of the name on the label and without knowing this there is no way to make meaningful assessments of a mattress, identify any potential “weak links”, or make informed buying decisions or meaningful quality or value comparisons with other mattresses.
As you can see in post #13 here as well … I would also avoid using reviews to assess the quality or comfort of a mattress because most reviews have little meaningful information about the mattress itself or how suitable it may be for your own specific needs and preferences (although they can be helpful in assessing the merchant you are dealing with).
Once you get to step 3 in the guidelines … you have some good options or possibilities available in the Vancouver area which are listed in post #2 here.
Hope this helps 
Phoenix