Hi mattressseeker,
The first place I would start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines that can help you make the best possible choices … and know how and why to avoid the worst ones.
Post #1 here has more information and an analysis of the Saatva mattresses and a forum search on Saatva (you can just click the link) will also bring up much more information and feedback about them as well.
For most people they would be a “better than average” choice compared to most mainstream mattresses (most of which aren’t particularly good quality or value) but they may not be the “best” choice available for the members of this forum that are a little more knowledgeable and are much more aware of the many other good quality/value choices available to them that compete well with the best in the industry.
Phoenix