Hi audiohead,
You’ve probably seen this but post #21 here has a list of the members here that sell mattresses online and includes many that sell latex mattresses. They have a wide range of different designs and options available but all of them would make good choices and be well worth talking to. Some of them also have options that may not be listed on their site so if you have specific criteria that are important to you then it would be well worth asking. I think highly of all of them and they all compete well with the best in the industry in terms of quality, service, and value and the one that is “best” for you would depend on all the objective, subjective, and intangible factors involved with any mattress purchase that are the most important parts of your personal value equation.
I wouldn’t hesitate to purchase from any of them I’m looking forward to finding out what you end up choosing 
Phoenix