Hi baggedmada,
The first place I would start your mattress research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help you make the best possible choice … and more importantly know how and why to avoid the worst ones including major brands such as Serta or any manufacturer that doesn’t provide the information you need about the quality of the materials inside their mattress to make an informed choice (see the guidelines here).
Unfortunately … the information you listed says nothing about the quality or durability of the materials in your mattress (see here) and that alone would be reason enough to avoid it.
There is also more about the most important parts of the value of a mattress purchase in post #13 here that can also help you to make more meaningful comparisons between mattresses … and avoid the likelihood of buyers remorse much too quickly after your purchase.
Once you reach step 3 in the tutorial if you let me know your city or zip code I’d be happy to let you know about any of the better options or possibilities I’m aware of in your area.
Phoenix