Hi Deenster,
Welcome to the Mattress Forum! 
While other people’s comments about the knowledge and service of a particular business can certainly be very helpful, I would always keep in mind that you are the only one that can feel what you feel on a mattress and I would be cautious about using anyone else’s suggestions, experiences or reviews on a specific mattress (either positive or negative) here on the forum as a reliable source of information or guidance about how you personally will feel on the same mattress or how “comfortable”, suitable, or how durable a mattress may be for you. A mattress that would be a perfect choice for one person or even a larger group of people may be completely unsuitable for someone else to sleep on (even if they are in a similar weight range). Other people’s experiences in general won’t tell you much if anything about the suitability, quality, durability, or “value” of a mattress for any particular person, or whether or not it might be comfortable for you personally (see post #13 here). The Sleep On Latex mattress you’re considering certainly does use high quality and durable materials and is available in Soft, Medium or Firm.
As you’re considering something online and you can’t test a mattress in person, the most reliable source of guidance is always a more detailed phone conversation with the manufacturer who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept on and liked or other mattresses you are considering that they are familiar with, and the “averages” of other customers that are similar to you. They will know more about “matching” their specific mattress designs, options, and firmness levels to different body types, sleeping positions, and preferences (or to other mattresses that they are familiar with) than anyone else. At that time you can also find out about any exchange, return, or any options they have available to customize a mattress after a purchase can help lower the risk of an online purchase.
You may wish to also use the expertise of the members listed in post #21 here who are all very experienced and knowledgeable and specialize in providing the type of help and guidance on the phone that can help you make good choices. There are a wide range of latex and memory foam and other options included in the choices there and I believe that all of them compete well with the best in the industry in terms of their quality, value, service, and transparency. From this list, My Green Mattress, SleepEZ, Rocky Mountain Mattress, Dreamfoam, and Latex Mattress Factory all offer “simplified” latex mattresses that are more basic in configurations and in your price range. This list is of course by no means complete, but it will give you a good start of items to compare.
Phoenix