Hi Indylady18,
I think dn has covered most of the comments I would make but I would keep in mind that each of the different manufacturers you are considering may have differences in the the design, materials, and components of their mattresses which can make a significant difference in the suggestions they make to you (see post #8 here).
If you can test a mattress in person then I would use the results of your testing to make a choice but if you are dealing with an online manufacturer I would make your initial choice of layering for the mattress you are considering based on your conversations with each one … even if they seem to be different from each other. They will know more about their own mattresses and the combinations that they have had the most success with than anyone else.
I’m guessing that you may have misunderstood their suggestion and it’s probably upside down because I doubt that Flobeds would ever suggest having two soft layers on the bottom of their mattress. It would make no sense and the convoluted layer would never be on the bottom.
The manufacturers you’ve mentioned all use good quality materials but there are certainly some significant differences between some of them.
Savvy Rest is in a higher price range than both SleepEz and Foam Sweet Foam which offer very similar mattresses and options (assuming you are choosing the same type of latex in all the layers in the same firmness levels) and Flobeds is a different design from any of these. You can also see some comments about AstraBeds in post #2 here and post #3 here (they are more of a marketing company than a mattress company) and a forum search on Astrabeds (you can just click this) will bring up more information about them as well.
Phoenix