Hi handsoap,
I’m not sure if there is much I can add to my previous replies including post #9 here about the different ways that one mattress can "match another one and post #2 here about the different ways to buy a mattress (either online or locally).
If you are trying to “match” the feel and firmness of another mattress you would either need to test a local mattress in person so that you can assess whether a mattress is a reasonable “match” for the Rhapsody Luxe based on your own personal experience, go by the online description of a reliable manufacturer or retailer that indicates in their description that one of their mattress is a reasonable approximation for the Rhapsody Luxe, or talk with an online manufacturer or retailer on the phone that sells memory foam mattresses so that they can tell you which of their mattresses is a reasonable approximation of the Tempurpedic Rhapsody (if any).
Several of the retailers and manufacturers in the memory foam list that is linked in the tutorial make memory foam mattresses that are designed to approximate some of the Tempurpedic mattresses (including the Rhapsody) that would be well worth talking to.
Even if a mattress has a similar firmness and “feel” to the Rhapsody Luxe though … with your higher weight I would also make sure that the density of the materials in the mattress is suitable for your weight range because a mattress that “feels like” the Rhapsody but uses lower quality/density and less durable materials won’t maintain it’s comfort and support or “feel” for as long as the Rhapsody or other mattresses that use the same quality/density materials.
The foam quality/density guidelines that I would suggest are in post #4 here and there is also some information in post #3 here and the posts it links to that should be helpful for those that are in higher weight ranges. Higher weight ranges will generally need or prefer firmer mattresses (firmer materials will feel softer because you will sink into them more) and materials and components that are higher quality and more durable than the minimums in the guidelines because the materials and components in a mattress will soften and break down faster for those in higher weight ranges than they will for someone that is in a lower weight range that doesn’t compress the mattress as much.
While Dreamfoam has said that the Aria has a similar firmness level to the Tempurpedic Luxe and it’s certainly great “value” … I would also be aware that it uses 4" of 4 lb memory foam and a 1.8 lb base layer. These would certainly be suitable in terms of density and durability for more average weight ranges but they would also be lower density and less durable than the memory foam and base layers in the Rhapsody and would be a lower density than I would normally suggest for someone in your weight range (more than the lower 200’s or so) where I would look for 2 lb polyfoam in the base layers and I would reduce or minimize the use of 4 lb memory foam in the comfort layers.
The Eurotop mattress is a completely different mattress and latex is a very different material than memory foam so it would be more of an apples to oranges comparison. There is more about how latex compares to memory foam in post #2 here. It certainly uses high quality materials that would be durable enough for your weight range (blended Talalay latex and a 2 lb base layer) but it won’t feel anything like a memory foam mattress. It also has the advantage of being able to exchange the latex layer for a firmer or softer layer for a nominal cost (see here) if your original choice is either firmer or softer than you prefer.
While your own careful testing or personal experience is the most reliable way to know whether a mattress is a good “match” for you in terms of comfort and PPP (or is a reasonable approximation of another mattress) … when you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using (fast or slow response, resilience, firmness etc) and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else.
Phoenix