Hi jjklentils,
The first place to start your research is the tutorial post here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how to avoid the ones that are more risky.
Brooklyn Bedding is one of the invited members of this site which means that I believe they compete well with the best in the country in terms of quality, value, and service. They are well worth talking to about which of their mattresses or which comfort option may be the most suitable choice for you.
You can read more about the Prana mattresses in post #3 here and this thread and I would be very cautious with these because they use thicker layers of polyfoam on top of the latex so you would be feeling polyfoam as much or more than the latex and they could also be a “weak link” in the mattress (I would tend to avoid one sided mattresses with more than about an inch or so of lower quality/density polyfoam in the top layers).
They are also in a more premium price range than other “mostly latex” mattresses that may be available to you either locally or online.
Phoenix