Hi Melillo,
Only you can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved for anyone to be able to make specific recommendations or suggest a specific mattress or combination of layers based on specs (either yours or a mattress), health conditions, individual circumstances, or “theory at a distance” (see mattress firmness/comfort levels in post #2 here).
Outside of the information, suggestions, and guidelines in the tutorial post … post #3 here and the posts it links to also have more information that will be helpful for those that are in higher weight ranges to make the most suitable and most durable possible choice.
The tutorial post includes several links to lists of the better online options I’m aware of and if you let me know your city or zip code I’d be happy to let you know about the better options or possibilities I’m aware of in your area.
One of the most effective “shortcuts” that can help cut through much of the confusion when you are buying a mattress is to focus on finding and dealing with knowledgeable and experienced retailers and/or manufacturers that have your best interests at heart (and aren’t just interested in selling you anything that they can convince you to buy). These are the ones that already know what you would otherwise need to learn and understand the importance of choosing a mattress that is a good “match” for you and knowing what is inside any mattress that you are considering. They can provide you with the type of information and guidance that can help you make the best possible choice. Who you choose to deal with can be one of the most important parts of a successful mattress purchase.
Phoenix