Hi Manboy,
I would start by reading the tutorial post here (which is the first post of this topic you posted in) which has all the basic information steps, and guidelines that you will need to make the best possible choices … and know how to avoid the worst ones (such as Tempurpedic) and hopefully keep you away from chain stores such as Sleep Country as well.
Once you get to step 3 and are ready to start testing mattresses … some of the better options or possibilities I’m aware of in the Toronto area are included in post #1 here.
Phoenix