Hi Johnp,
There are two options on the list that sell all latex mattresses in NY (they are in the last group of 5 “better value” choices.
In the end if you are making a local purchase … then the layering isn’t as important as whether it provides you with the best possible pressure relief and alignment because you can test the mattress locally. With an online purchase where you can’t know for certain how well a mattress may perform (except based on the “averages” of other people and by using your local testing as a rough guideline) … then the layering and any exchange options may be more important to allow for more customizing after the purchase and to reduce the risk of an online purchase. all of these are part of each person’s “value equation”. Different designs and types of layering can produce a similar end result for each person.
At Magic Sleeper … the Eco line is made by Natura which make some high quality mattresses but not usually in the same “value range” as the mattresses that they make themselves (although they use thicker layers of wool which is a more costly material).
There are two options in the list I linked in NYC which have all latex mattresses (Dixie Foam and Scottjordan) which may be worth considering and which may have better value than the ones you are mentioning.
At SleepEz … the organic line uses the more costly version of Dunlop which has certified organic latex while their regular line uses 100% natural dunlop. There is very little if any difference between certified organic Dunlop and 100% natural Dunlop except that one has a certification and one doesn’t.
Shawn prefers to downplay the “organic” version because as you can read in the previous post I linked about the different types of latex … when it first came out only the raw materials were certified and there was a law suit about whether it could really be called organic (even though many people on the web were doing so). Latexco which distributes Latex Green Dunlop latex has since announced that the manufacturing of the latex has now also been certified. This means that latex Green has two different types of 100% natural Dunlop … one of which is certified and one which isn’t. There is no meaningful difference between them in terms of performance or quality but the “organic” version(which SleepEz and others use in their “organic” line) is a more costly material because of the expenses involved in the certification process. It would be most attractive to those that valued the certification itself rather than any significant difference between the materials or in its manufacturing.
This is why he said there would be “no difference” even though the Dunlop they use in their organic line is exactly the same more costly material as others are calling their “certified organic” dunlop latex and the Dunlop they use in their regular line is “only” 100% natural Dunlop and less costly because it hasn’t been certified. Shawn tends to under promise and overdeliver and like all better manufacturers and retailers will give you advice that works towards your best interests rather than his profit margin 
Phoenix