Hi plasticpitchfork,
There is more about the most important parts of the “value” of a mattress purchase in post #13 here that can help you make more meaningful comparisons between mattresses. The most important part of your purchase will be PPP (Posture and alignment, Pressure relief, and Personal preferences) and how well you sleep on the mattress.
When you can’t test a mattress in person then the options you have after a purchase to return or exchange the mattress if your experience indicates that it’s not as good a match for you in terms of PPP as you hoped for would generally become a more important part of your personal value equation because the only way to know for certain whether a mattress is suitable for you is your own personal testing or experience.
The next most important part of a purchase is the quality of the materials inside the mattress so to make meaningful comparisons you need to know the specifics of any mattress you are considering (see this article) so that you can identify any weak links in a mattress and make more meaningful meaningful comparisons between mattresses. Lower quality and less durable materials are generally less costly than higher quality and more durable materials so I would tend to avoid paying higher prices for mattresses that use lower quality materials than a competitor in a similar price range (and as you can see in the guidelines here I would also avoid any mattress where you aren’t able to find out the information you need about the type and quality of the materials inside it to make an informed purchase).
The type of materials or the type of mattresses that you are considering is a matter of personal preference so only you can decide this.
If you are in the Chicago area then the better options or possibilities I’m aware of are listed in posts #2 and #4 here and if I was in your shoes I would also pay a visit to Quality Sleep / My Green Mattress who are one of the members of this site and compete well with the best in the industry in terms of quality, service, value, and transparency. This would give you a chance to test mattresses in person to see which type of mattresses you tend to prefer.
I’m assuming that you are talking about Naturesleep.ca rather than Naturesleep.com (which is a completely different company) and I would read this topic before making a purchase from them.
Phoenix