Hi pbos,
I split your topic into a topic of its own so your questions don’t get mixed in with a more general topic.
Unfortunately there are too many unknowns, variables, and personal preferences involved for anyone to be able to make specific recommendations or suggest a specific mattress or type of materials that you may do well with based on specs (either yours or a mattress), health conditions, individual circumstances, or “theory at a distance” (see mattress firmness/comfort levels in post #2 here). Having said that I can certainly make some suggestions about “how” to choose that may be helpful.
Post #2 here and the more detailed posts and information it links to have more information about safe, natural, organic, “chemical free”, and “green” mattresses and mattress materials that can help you sort through some of the marketing information and terminology that you will encounter in the industry and can help you differentiate between them and answer “how safe is safe enough for me” so you can decide on the types of materials you are most comfortable with having in your mattress. These types of issues are complex and are generally specific to each person and their individual sensitivities, circumstances, criteria, and lifestyle choices. Latex can certainly be a good choice for people that are very sensitive.
Once you have decided on which materials you are comfortable with having in your mattress then choosing a mattress that only contains that type of materials will be much easier.
Anecdotally there are more people that have issues with Tempurpedic than many other types of memory foam and their memory foam isn’t CertiPUR certified but of course they are also sell more memory foam mattresses than anyone else so this may also be part of what accounts for the number of reports of people that are sensitive to them.
There are also more people that are sensitive to memory foam than polyfoam so if you have slept on mattresses that contains polyfoam previously without any sensitivity issues then this may be worth considering as well and this would open up many more choices for you than only considering mattresses that use an innerspring and natural fibers.
The Intelligel (or other buckling column gel materials) would also be a “safe” material for most people but of course their mattresses also contain polyfoam as well and the buckling column gel is only one of the layers in their mattress.
Phoenix