Need supportive mattress for back and neck pain

Hi, I have spent a whole afternoon trying out lots of mattresses in two different stores. I had pretty much decided on one. It was pocket sprung with memory foam - retailing at £450. Unfortunately when I googled it once home, the company selling it and the mattress itself seemed to get bad reviews. Talk of it sagging after a couple of weeks. I luckily did not buy on the spot. But now feel like I am back at square one!

That is why I found your site. There seems to be a wealth of information here, but the mind boggles. If you can offer any advice it would be much appreciated. My budget is about £500. I liked the feel of memory foam mattresses that I tried. I am small, 5'5 and 47KG, my partner is 64Kg. I am having problems with my neck/back and therefore know I need something with some support. We currently have a mattress that is over ten years old, single coil, I believe. It creaks and is definitely past it's best. I notice you do not have many mattresses for sale in my price range, but any suggestions gratefully received. Do you also advocate buying without trying?

Or is there a showroom to try the products you sell?

Thanks so much for your help Clare >