Hi Peterpan1121,
It’s unfortunate that you didn’t find us before you made your purchase since it may have helped prevent you from being in a somewhat difficult situation where you need to exchange a mattress and there may be no good quality/value options to choose from.
There is some information in post #2 here about the two main strategies I would use when you are in this type of situation and you aren’t able to return your mattress for a refund.
Unfortunately … none of the specs you listed provide any meaningful information about the quality of the materials in any of the mattresses (see this article for the information you need) so hopefully someone in the store will be able to provide them to you and if you post them on the forum I’d be happy to make some comments about the quality/durability of the materials but even if the memory foam in these mattresses was a suitable density (4 lbs or higher) which isn’t likely … the 2" polyfoam layer in all of them is a lower density foam than I would be comfortable with and would be on the edge of being a weak link in the mattress all by itself. I would avoid all of these.
Having other stores in the area probably wouldn’t make any difference anyway since if I understand correctly you are limited to an exchange in the store you purchased from but if you are able to get a refund and start all over again then if you let me know your city or zip code I’d be happy to let you know about any of the better options or possibilities I’m aware of in your area.
Phoenix