Hi WJK59,
Unfortunately I can’t provide any specific guidance about which mattress to choose because I don’t have any personal experience on any of the mattresses you are considering and even if I had … each person’s specific needs and preferences can be very different and only you can feel what you feel on a mattress. A mattress that is “perfect” for one person can be completely unsuitable for someone else to sleep on even if they have a similar body type and there are just too many unknowns, variables, and personal preferences involved for anyone to be able to predict with any certainty which mattress will be the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) based on specs (either yours or a mattress) or "theory at a distance (see mattress firmness/comfort levels in post #2 here).
Having said that … I can make some general suggestions that can improve your chance of making the best possible choice.
Since it seems (based on your comments) that your current mattress is too firm for you … there are some some suggestions in post #2 here that may be helpful if the cause of the issues you are having isn’t the mattress itself (such as the type of mattress protector or any mattress pad you are using or the pillow you are using).
If these aren’t helpful then the next suggestion is to make sure that you are using the testing guidelines in the tutorial to test a mattress for PPP. This includes testing carefully and specifically for Posture and alignment, Pressure relief, and your Personal preferences and the “feel” of a mattress … all of which are different from each other. I would make sure that you are fully prepared for mattress testing with light and loosely fitting clothing, with a suitable pillow (either your own or from the store) and with any sleeping partner testing the mattress with you. You will also need to make sure that you spend enough time on a mattress (at least 15 minutes) fully relaxed so that your testing can be as reliable as possible and come reasonably close to predicting your actual sleeping experience. For most people … careful testing will be “close enough” to predict their actual sleeping experience and they will end up choosing a mattress that is well inside the comfort and support range that is suitable for them so only minor minor fine tuning will be necessary … if any fine tuning is necessary at all (see post #4 here).
If this is the type of testing that you did when you chose your mattress or if for any other reason you have little confidence in your ability to test a mattress that can predict your actual sleeping experience then the options you have after a purchase (or an exchange) if you make a choice that isn’t as suitable as you hoped for would likely become one of the most important parts of your choice.
Based on this … it seems that if you choose another Charles P Rogers mattress you will need to trust your own testing and have confidence that it will be a suitable match for you because the only options you would have afterwards to do any fine tuning would be adding additional pressure relief or “comfort” with a mattress pad or a topper if your mattress is too firm (and you would have few good options if you choose a mattress that is too soft). I would also keep in mind that Powercore Plus Cool Ultra is a memory foam hybrid while the Estate 9000 Luxury Plush is a softer latex hybrid so a big part of the choice between them (outside of cost) would be your preference between sleeping on memory foam vs sleeping on latex (see post #2 here).
I would also make sure that you are able to find out the specifics of all the layers in any mattress you choose (see this article for the information you will need to make an informed choice) because while this may not make a difference in terms of PPP … making sure that there aren’t any weak links in your mattress and that the useful life of the mattress will reasonably reflect the price you paid is an important part of the “value” of a mattress purchase over the longer term. There is more about the most important parts of the “value” of a mattress purchase (or exchange) in post #13 here
I think that covers most of the options that are available to you at Charles P Rogers but it comes down to a return and refund with no costs or risk involved and starting over again or choosing a mattress to exchange for at an additional cost and having very limited options available if your exchange turns out not to be a suitable choice.
If you do decide on the refund and to start over again again then the first thing I would consider with BE is whether the adjustable foundation makes enough of a difference to justify the additional cost. You can see some comments about this in post #2 here and the posts it links to but I would make sure that you test any of their mattresses both with and without it because their adjustable foundation is an option not a necessity and for some people it would be an improvement, for some it would be “neutral” and for others yet it may be a detrimental. If you don’t need it or it doesn’t make enough of a difference to justify the additional cost then it can put the BE options into a more comparable budget range.
Again, I can’t provide you with any specific suggestions about which mattress would be the most suitable choice for you at BE (or any other retailer or manufacturer that would be available to you with a refund) … and the same guidelines would apply as buying any new mattress. One of the advantages of a BE mattress is that they have good options available after a purchase to fine tune either the comfort or support of the mattress so you would have more options available to you other than just exchanging the mattress for another one but they only have a 30 day return policy with a 35% fee involved so you would need to decide on whether you are confident that the options you would have after a purchase would be “enough” to make sure that one of their mattresses was a suitable choice for you either before or after any adjustments.
There is also more about the different ways to choose a mattress (either locally or online) and how to reduce the risk of each of them in post #2 here but once again if you aren’t confident in your testing then the options you have after a purchase (or an exchange) would probably become one of the most important parts of the “value” of any purchase or exchange decision.
Phoenix