Hi marcie7467,
You can see some of my thoughts about the technogel in post #2 here and some comments about the specific materials in two of them (the Estasi and the Piacere) in post #2 here. A forum search on technogel (you can just click this) will bring up more posts and feedback about them as well.
Some of the Restonic latex mattresses can be good quality and value but Restonic is a licensee group which has different manufacturers that use different specs across the country so it would be important to know the details of all the layers to make sure that there isn’t more than about an inch or so of polyfoam above the latex. Once you get to about 2" or more then any polyfoam in the upper layers can become a weak link in the mattress. They often have 2" of firm polyfoam in the bottom layer which I would’t consider to be an issue in terms of design or durability.
The adjustable bed thread here should be helpful.
Some of the better options and possibilities in the Dallas area are listed in post #4 here.
Phoenix