Hi SleeplessinDallas,
Yes … some of the manufacturers that I’ve invited to become members of the site (so far) and sell online are listed in post #21 here and some of the better memory foam manufacturers that sell online (including some that aren’t members yet) that I also think highly of are listed in post #12 here. Many of them sell mattresses that are close equivalents to the Tempurpedic line in one or more ways (see post #9 here). Arizona Premium Mattress specializes more in high quality/value latex mattresses although he does have some memory foam mattresses on his site.
Yes you have a great base and a topper can certainly be a good solution for a mattress that is too firm (and there are some topper guidelines in post #2 here). Unfortunately it’s not at all unusual that the dreaded demon of “aging” takes its toll and our needs or preferences on a mattress change … in most cases towards softer. Of course I’m not speaking from experience here (cough).
I think highly of all the retailers or manufacturers on the lists and they are all knowledgeable and experienced and will provide good guidance and insights when you talk with them on the phone. There are none I would “steer clear of”
Phoenix