Hi kmcd,
Have you read the tutorial post here.
The tutorial also includes a link to a list of some of the online retailers and manufacturers that are members of the site that make a wide variety of latex mattresses in different price ranges, using different types of latex, and that have many different designs, features and options.
If you let me know your city or zip code I’d also be happy to let you know about any of the better options or possibilities I’m aware of in your area.
The three manufacturers you are mentioning all use good quality latex in their mattresses but there are also other similar options available to you that may be well worth considering and I would make some careful value comparisons based on the criteria of your personal value equation that are most important to you before making a final choice.
A forum search on Plushbeds and Habitat and Foam Sweet Foam (you can just click each of these) will bring up more information and comments about each of them.
Phoenix