Hi davo32683,
OMF makes some mattresses that use high quality materials. The Serenity uses a polyfoam core (I’m not familiar with the density), with latex of differing ILD on either side (it’s a two-sided mattress).
The Berkeley Ergonomics (BE) Ergo zoned latex mattress uses 100% natural Talalay from Radium, and it is one-sided. The 6" latex core has some zoning to it, or can be ordered un-zoned. This is topped with 2" of Talalay. The cover is organic cotton and organic wool quilted together. Many of these models are shown on their slatted base, which can also influence the comfort of the mattress. I think highly of Berkeley Ergonomics and their products.
Finding products that are similar to the BE isn’t too difficult, as there are quite a few component latex mattress systems available, with many of what I feel are the best in the industry offered by the site members listed in post #21 here. They are all very experienced and knowledgeable and specialize in providing the type of help and guidance on the phone that can help you make good choices, and I have confidence in their quality, value, service, and transparency.
Hopefully that gives you a good place to start in your search.
Phoenix