Hi jstevanus,
Welcome to the Mattress Forum! 
Unfortunately, I don’t think that research was done here, as we could have helped you with some advice about that purchase. I’m sorry your air mattress isn’t working out well for you 
, but hopefully the information here and on the rest of site can assist you in making a better-informed decision this go-around.
While many people do prefer a pocketed spring mattress using latex or memory foam on top, only your own personal testing would determine whether such a product might agree with your particular needs and sleeping style.
Like anything, a hybrid mattress can be expensive, but there are some more affordable options available, some from the site members listed in post #21 here.
The Eco Sleep is a new model (thanks for bringing it up) using the 6" Bolsa pocketed spring unit from Leggett and Platt. The mattresses.net web site shows the Caliber Edge version of this spring unit, but they don’t mention it in the video or on their web site as using the version with the actual Caliber Edge (I couldn’t tell from the video either). Just that it is 13.75 gauge steel and the 6" version. I’ve recently seen this new spring unit from Leggett and it is a firm support unit and an improvement upon their older version. This spring unit would be a more basic version of the Combi-Zone Quantum Edge spring unit Arizona Premium uses in their Ultimate Hybrid mattress. The latex is 3" of blended Talalay, which is a high quality and durable material, available in four firmnesses. The zippered cover is quilted to natural wool, like in the Ultimate Hybrid.
Overall the mattress uses good quality and durable materials, and this mattress would be considered a more affordable latex hybrid mattress as compared to their Ultimate Hybrid product. Arizona Premium (mattresses.net) is a member of this site which means that I think very highly of them and that I believe that they compete well with the best in the industry in terms of their quality, value, service, knowledge, and transparency.
If you’re attempting to decipher how this mattress might feel by testing out other products locally, unless you are able to find a product that used the same spring unit with the same latex in the same softness and thickness, and the same covering, it would be mostly wasted time, as every component within a mattress influences the overall feel, support and comfort.
When you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc.) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs, options, and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
As for recommendations, there are too many unknowns, variables, and personal preferences involved in choosing a mattress for someone else to make specific suggestions based on specs (either yours or a mattress) or theory at a distance that can possible be more accurate than your own careful and objective testing (using the testing guidelines in the tutorial post) which is always the most reliable way to predict which mattress will be the best match for you in terms of PPP (see post #2 here). Instead, the commentary here focuses more on the “how” to choose versus the “what”, along with assistance in assessing the quality of materials used in a mattress, which in this case would be higher quality and durable materials.
You may wish to place a phone call to mattresses.net with any specific questions you have if you are considering ordering this item, as they will be best able to give you specifics about this mattress along with their opinion of which plushness might best suit your needs.
Phoenix