Hi Tulrin,
Subject to first confirming that any retailer or manufacturer on the list you wish to deal with is completely transparent (see this article) and to making sure that any mattress you are considering meets your specific criteria and the quality/value guidelines here … the better options or possibilities I’m aware of in and around the Washington, DC area are listed in post #2 here.
While I certainly agree with you that Nest Bedding is a solid company (and as you know they are one of the members here as well) … the Energex is a polyfoam material that is more resilient than memory foam so it won’t be quite as motion isolating as memory foam (although it would be “motion isolating enough” for many people. They also carry memory foam mattresses that would likely be more motion isolating than the Love Bed as well. As you mentioned it would also make sense to talk with them on the phone (along with any other online choice that you are considering) and I consider a phone conversation to be one of the most important parts of making any online mattress purchase.
You’re certainly right that there is no wrong or right answer because unlike the quality and durability of the materials in a mattress which are more objective and that you can assess before a purchase … the only way to know for certain how well you will sleep on any mattress or how it will compare to other mattresses that you could have purchased or how well it will meet all the criteria that are important to you will be based on your own personal experience.
Once you have narrowed down your options to a list of finalists that are all choices between “good and good” and you have confirmed that none of them have any lower quality materials or “weak links” in their design and if at this point there are no clear winners between them (which is usually a good indication that you have done some good research) then you are in the fortunate position that any of them would likely be a suitable choice and post #2 here can help you make a final choice based on your more detailed conversations with each of them, your personal preferences, your confidence about PPP and the suitability of each one, their prices, the options you have after a purchase to fine tune the mattress or exchange or return the mattress or individual layers and any costs involved, any additional extras that are part of each purchase, and on “informed best judgement” based on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you.
In its simplest form choosing the “best possible” mattress for any particular person really comes down to FIRST finding a few knowledgeable and transparent retailers and/or manufacturers (either locally or online) that sell the types of mattresses that you are most interested in that are in a budget range you are comfortable with and that you have confirmed will provide you with the all the information you need about the materials and components inside the mattresses they sell so you will be able to make informed choices and meaningful comparisons between mattresses and then …
-
Careful testing (hopefully using the testing guidelines in the tutorial) to make sure that a mattress is a good match for you in terms of “comfort”, firmness, and PPP … and/or that you are comfortable with the options you have available to return, exchange, or “fine tune” the mattress and any costs involved if you can’t test a mattress in person or aren’t confident that your mattress is a suitable choice.
-
Checking to make sure that there are no lower quality materials or weak links in a mattress you are considering relative to your weight range that could compromise the durability and useful life of the mattress.
-
Comparing your finalists for “value” based on #1 and #2 and all the other parts of your personal value equation that are most important to you.
I’m looking forward to finding out what you end up deciding 
Phoenix