Hi Overwhelmedsleeper,
Post #1 here (and the links it includes to read) has a series of steps that can dramatically increase the odds of buying a high quality and value mattress in any budget range.
Most importantly it will help you eliminate your worst choices (such as major brands or most chain stores) and help you know how to tell which are the better ones (both in terms of a manufacturer or retailer and a specific mattress).
Serta (that makes the icomfort) is one of the “major brands” that I would avoid unless there is a particularly compelling reason that they would be worth considering for you. You can see more information about the iComfort lineup in post #11 here.
Denver Mattress’ “mostly latex” mattresses are usually among the better quality/value choices in most areas where they do business. A forum search on “Snowmass” (you can just click this) will bring up many posts and lots more information about them.
My thoughts about airbeds are in this article but they can be summarized as “for most people they are a waste of money”.
The links in the post I linked earlier includes some generic information about how different heights and heights and sleeping positions need different types of mattresses and on which types of mattresses and materials can be cooler than others (and there is more information about sleeping cool in post #2 here) but these are more generic guidelines and because of the many variables involved … personal testing specifically for pressure relief, alignment, and your other personal preferences will always be more accurate than a “formula” or “theory at a distance”.
Yes … the better options or at least “possibilities” I’m aware of in the Louisville area are listed in post #3 here
Hope this helps 
Phoenix