Hi katherine4,
The most reliable way to choose a mattress that is suitable for you is to follow the steps in the tutorial post here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how and why to avoid the worst ones.
There are too many unknowns, variables, and personal preferences involved for anyone to recommend a specific mattress (or even a top 10) for someone else based on specs (either yours or a mattress) or “theory at a distance” out of all the many thousands of mattresses that are available in the industry so it’s really only possible to help with “how” to choose rather than “what” to choose (see mattress firmness/comfort levels in post #2 here).
As AnalogJ mentioned there is no such thing as a “best” mattress … only a mattress that is “best for you” based on your individual criteria and the parts of your personal value equation that are most important to you. There is more about the most important parts of the “value” of a mattress purchase in post #13 here.
Most people that are looking for a “natural” innerspring mattress would likely be looking for either natural fibers (such as the VI Springs that AnalogJ mentioned) or natural latex in the comfort layers over the innersprings although there are also synthetic materials or foams that are more common in innerspring mattresses that most people would also consider to be “safe”. Post #4 here has a list of many innerspring/natural fiber mattresses and many of these also make innerspring/latex hybrid mattresses aw well. You could check their websites or call them to see if any of them have any retail stores in your area.
I’m not sure where you are in Connecticut but post #2 here also includes some of the better options and possibilities I’m aware of in the Connecticut area as well and some of these carry mattresses that use natural materials that may fit your criteria.
Phoenix