Hi thefussys,
You can read about the pros and cons of latex here and the pros and cons of memory foam here.
In my last post (#2) I included links to online options for memory foam and latex which have many options for both with a wide variety of different options and some of the best quality and value in the country.
Post #2 here includes the better options and possibilities I’m aware of in and around the Minneapolis area. If I have a chance later tonight or tomorrow I’ll take a quick look around Saint Cloud to see if there are any other options that may be worthwhile that are a little closer to you outside of the one in Waite Park that is already on the list (now done … see post #5 here).
Phoenix
PS (Added later) I switched your other post to this topic because my reply would apply to both of them. I’ll try my best to take a look tomorrow for any options that may be available in the area but in the meantime I would focus first on deciding whether you prefer fast response materials (like latex) or slower response materials (like memory foam) in your comfort layers. Were you able to try any latex in your testing to see how it felt compared to the memory foam mattresses you tried?