Hi Beasleysmom,
I would think you are “in the range” yes although this will depend to some extent on your body weight. You can see the “normal” guidelines I would use for foam quality/density specs in post #4 here but for occasional use I would consider mattresses that are “one step down” in terms of the quality/density of the materials which means that for “average” weight ranges I would use 3 lb memory foam as a minimum and for higher body weights I would use 4 lbs. I would continue to use 1.5 lbs as a minimum for the density of the polyfoam support layer.
Comfort and durability though are completely separate issues. Foam density is closely related to durability and how long a material will maintain it’s original properties but both lower density and higher density materials can come in a wide range of firmness levels so if you can’t test a mattress in person for PPP then I would make sure you have a more detailed conversation with an online manufacturer or retailer so they can help “talk you through” which of their mattresses would be most suitable for you because it’s not really possible to use quality/density specs to predict how a mattress will feel or perform for you in terms of PPP (see mattress firmness/comfort levels in post #2 here).
Post #4 here includes some of the better online sources I’m aware of for lower budget memory foam mattresses but if you know that the Tempurpedic Cloud Supreme is a good match for you in terms of PPP then it would make sense to choose a mattress that you can confirm is reasonably close because that would cover both the suitability part and the durability part of the overall “value” of your purchase (see post #13 here).
Phoenix