Hi buttercupbetty,
Just in case you haven’t read it yet … the first place to start is post #1 here which has all the basic information, steps, and guidelines that can help you make the best choices.
I think highly of Brandon at SleepingOrganic (see post #2 here) but I agree it’s always a good idea to at least do some good local testing before considering a long distance or online purchase so you are more familiar with the differences in different types of layering and the “feel” of different types of latex.
Some of the better options I’m aware of in the Seattle area are listed in post #2 here and you would have the chance to test different versions of both Dunlop and Talalay mattresses.
Once you have decided on your finalists both locally and online then you will have some reference points about the options available to you and which of your final choices is the best “match” for your personal value equation.
Phoenix