I wish I had known about them a couple of years ago when I drove through the Dallas area too.
See Reply #6 in this thread. While they don't have a lot of mattress models, Phoenix had them custom build a 2 sided all latex mattress for him. I would call and ask if they would do the same still. Also, ask what they have available to try out although trying any mattress for a short time may not tell you a lot.
http://www.whatsthebest-mattress.com/forum/overstuffing-mattress-case-foam-layers/16508-A-1.html
Some of Phoenix's other threads on his research have disappeared there are some helpful ones left but getting harder to find.
http://www.whatsthebest-mattress.com/forum/latex-toppers/16314-0-1.html
This web site indicates there is a range of latex choices for this company: http://www.themattressfactory.com/MattressesBeds/Models/BarringtonFoamandLatex.aspx
This message was modified Jan 16, 2012 by Sall