Hi vybo.
Welcome to our Mattress Forum! 
The Mattress Shopping Tutorial is a general overview of different steps and processes that have the highest probability to lead to a successful mattress purchase. I have updated the tutorial the detailed version of step #4 and included two more links that will help those in your situation.
When you can’t test a mattress in person then the most reliable source of guidance is always a more detailed phone conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart and who can help “talk you through” the specifics of their mattresses and the properties and “feel” of the materials they are using . When choosing something online, it’s important to deal with experienced, educated and helpful manufacturers who have the knowledge to guide you through the process and find something that they honestly think will fit your specific sleeping positions, somatotype, BMI and individual needs. Post #2 here and this topic have more about the pros and cons of a local vs an online purchase. Make sure you also check for the various policies or benefits of dealing with the merchant which may provide additional value with your purchase (including any return or exchange policies). Use their help and guidance to help you test for PPP (Posture and alignment, Pressure relief, and Personal preferences).
For your ease of access this is the part of the tutorial that is directly related to your situation:
OPTIONAL: In those areas of the country where there are no better quality and/or value choices available … then I would look online and use the experience and expertise of our Expert Members of the site or of any of the 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.
The advice that is often given on this forum is not to “stay away” from the major manufactures but to “stay away” from any product where you aren’t able to find out the quality of the materials inside it, This is the reason for the first guideline in this article which suggests avoiding them completely (and the chain stores that sell them) The only exception I would consider is if you find out the quality of all the materials and layers and they were good quality materials and value which unfortunately you aren’t likely to find. Excluding the worst choices (which is probably about 75% of them or more) will help you focus on the better ones without being overwhelmed and frustrated by the lack of information or misleading information that you will encounter or worse yet spending the time and adding to the confusion. Buing a mattress for which you don’t know quality of the componentry within it something that I call “blind” mattress purchase which is usually a recipe for buyers remorse. You are looking at spending far too much money to consider a mattress that uses this much low quality materials when there are so many better choices available.
The forum search can also be a very useful tool to help you find the information you are looking for or if you come across information or claims that you are unsure about and you need a “fact check”. There is more about searching the forum in the help section here . Of course if you can’t find the information you are looking for then questions on the forum are always welcome and I (or another Expert Member of our site) will be happy to answer any questions you have or link you to a post or article that has answered your questions previously.
Perhaps you’ll do very well with a component style latex mattress, perhaps not, I have no way of knowing this as only you can feel what you feel on a mattress. The information throughout the site is offered to help anyone who wishes to take the time to make an educated choice. I understand your apprehension for deepening the research needed to minimize any risk connected with a mattress purchase as this an organic process that does not quite fit the “fast paced” world of instant gratifications and requires a bit of time, patience, learning about your needs and preferences, and how to avoid the worst choices that use lower quality materials that will soften or break down much too quickly that are so common in the industry. I wish that there was another way! The Mattress Underground’s role is to help the members here find better manufacturers and retailers that are more open and transparent, provide better service and guidance, and use better quality materials at better prices than most of the mainstream mattresses that the majority of consumers end up purchasing so you can find out what is in your mattress, learn which materials are more durable than others, make more meaningful comparisons between mattresses and whether you chose to make use of this or not is simply your own personal preference.
Phoenix