Hi chuck,
If you have spent an hour or two reading the tutorial then as sad as it is you would be more informed about mattresses and the materials inside them than the large majority of salespeople in the mainstream industry.
I would agree with this if you are comparing them to the major manufacturers that are most commonly available in the mainstream industry but as I mentioned in my previous reply for most people they wouldn’t be in the same value range as some of the options that the members here are aware of as a result of the information on the site.
Post #13 here has more about the most important parts of the “value” of a mattress purchase that can help you make more meaningful comparisons between mattresses in terms of suitability, durability, and value.
I don’t make specific suggestions or recommendations for either a mattress, manufacturers, or materials because only you can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved for anyone to know which type of mattress design or materials would be best for you based on specs (either yours or a mattress) or theory at a distance (see mattress firmness/comfort levels in post #2 here).
Having said that … the tutorial post includes two links to lists of the better online options I’m aware of (in the optional online step).
The better options and possibilities I’m aware of in the Chicago area (subject to the value guidelines I linked) are listed in posts #2 and #4 here and if you are in reasonable driving distance I would make sure you include My Green Mattress/Quality Sleep in your research. They are one of the members here which means that I think very highly of them and I believe they compete well with the best in the industry in terms of their quality, value, service, and transparency.
Phoenix