Hi willwanttosleep,
I would follow the steps in post #1 here and narrow down your local choices to just a few and eliminate any where you don’t know or can’t find out the specifics of every layer in the mattress.
Several of the online manufacturers that are on the list of online memory foam suppliers here can use your preferences with the Tempurpedic line (and sometimes other major memory foam brands) as a guideline if you can narrow down your choices to the one that works best for you (assuming that memory foam is your material preference).
If you are considering purchasing any of these mattresses then your personal testing is the only way to know which is most suitable and which you prefer. If you are using them as a guideline for an online purchase then outside of the Tempurpedics or perhaps the iComforts it’s unlikely that an online manufacturer would be familiar enough with the mattresses you listed to know which of the mattresses you mentioned were reasonable approximations for one of their mattresses unless you had all the specifics of all the layers. You can read a little more about matching one mattress to another in post #9 here.
Post #2 here has more information about how to make comfort and design choices and links to some of the theory involved but these are generic and not specific to any individual and you would either need to make a local choice based on your own personal testing (if the mattress is a good match for your personal value equation) or an online choice based on more detailed conversations with a knowledgeable and experienced online manufacturer who can use the “averages” of their customers or mattresses you have tested that they are familiar with to help you make the best choice out of the options they offer. If you narrow down your choices to two or three and list the specifics of all the layers I’d be happy to comment on the quality of the materials or help you identify any potential weak links in them but the most effective way to make design choices is based on your own testing (for a local purchase) or on more detailed conversations with online manufacturers who are in the best position to help you “match” what you have tested to one of the mattresses they make or sell.
Some of the better options and possibilities in the greater Los Angeles area I’m aware of are listed in post #2 here.
Phoenix