Hi tired of pillowtops,
Just in case you haven’t read it yet … the first place I would start your research is the mattress shopping tutorial here which has all the basic informtion, steps, and guidelines that you will need to make the best possible choices … and know how and why to avoid the worst ones.
Since you are in the St Louis area … and again in case you haven’t seen it yet … the better options and possibilities I’m aware of are listed in post #6 here with a brief description of what they sell.
This topic also has a bit of St Louis feedback from one of the members here as well.
This is one of their newest mattresses designed to approximate the Tempurpedic Cloud Elite which is one of their new models and I haven’t seen any forum feedback about it yet.
Phoenix