Composition of hybrid mattress

I am currently sleeping on a 5 year old Beautyrest recharge which has been a terrible disappointment. I am a 5’7", 125 lbs side-to-back sleeper with scoliosis and a herniated lumbar disc and the sagging of the Beautyrest has caused me daily back/hip pain and numbness in my arms and fingers. About 3 years ago I added a 2-inch latex topper which helped some but, of course, it cannot repair the sagging.
I am interested in the Ultimate Hybrid or Eco Hybrid from Arizona Premium Mattress but am not sure which one to get. Would a zoned mattress be preferable for my disc problem? Will one plush Talalay topper be sufficient since I am under 130 lbs and sleep on my side? My current latex topper is still in good shape so I am thinking about purchasing the soft Talalay layer with one of the pocket coil mattresses and an extra cover for my old topper to use in addition if needed. Does that sound like a reasonable approach?

I think because of your weight the Ultimate Hybrid might be overkill so I will recommend the Eco Sleep model with the Bolsa spring upgrade if you are needing a Queen or King. The Bolsa is only available for those sizes. I would choose the Soft Talalay and you can always use your 2" topper with the added cover if that is not soft enough for you. At your weight I don’t think the zoning will help much. However is you need something other than a King or Queen then yes, the Ultimate would be good choice. Thank you for your interest in our products.

Thank you, Ken.
I am looking for a twin XL to be put on an existing king size frame. My spouse and I have been sleeping on separate twin XL mattresses for almost 30 years since we have vastly different mattress preferences and needs and since he is still content with his current mattress ( which may change once he sees the new one…) I will consider the Ultimate Hybrid with the recommended topper. That should also minimize/equalize the potential height difference of our two different mattress models.
Thanks again for your time and advice.

No problem, call me direct if you want to discuss options further.