Hi psoup72,
The better options or possibilities I’m aware of in and around the Chicago area (subject to making sure that any mattress you are considering meets the quality/value guidelines here) are listed in posts #2 and #4 here
I don’t keep a record of the individual mattresses or their specs that the retailers and manufacturers in the hundreds of forum lists throughout the forum carry on their floor or have available online (it would be a bigger job than anyone could keep up with in a constantly changing market) but checking their websites and making some preliminary phone calls to the retailers/manufacturers that are on the local lists is always a good idea before you decide on which retailers or manufacturers you wish to deal with anyway. This will tell you which of them carry mattresses that would meet your specific criteria, are transparent about the materials in their mattresses, and that carry the type of mattresses that you are interested in that are also in the budget range you are comfortable with. Once you have checked their websites and/or talked with the ones that interest you then you will be in a much better position to decide on the ones that you are most interested in considering or visiting based on the results of your preliminary research and conversations.
Assuming that the materials in a mattress you are considering are durable enough for your body type and meet the quality/durability guidelines here relative to your weight range … the choice between different types and combinations of materials and components or different types of mattresses are more of a preference and a budget choice than a “better/worse” choice (see this article). The best way to know which type of materials or which type of mattresses you may tend to prefer in general terms will be based on your own careful testing and personal experience because different people can have very different preferences.
All a “coil on coil” mattress means is that a mattress has an innerspring as a support core and also includes a thinner microcoil (which is like a mini pocket coil) as one or more of the comfort layers above the innerspring instead of one the other good quality materials that can be used in the comfort layers as well. It certainly isn’t inherently any better or worse than another mattress that uses different materials and components. I would also keep in mind that there are many different mattresses in every mattress category and some of them may be a good match for you in terms of comfort, firmness, and PPP (Posture and alignment, Pressure relief, and your Personal preferences) and some of them that have a different design may be completely unsuitable for you to sleep on … even if it uses the same type of materials and components in the mattress.
Phoenix