Thank the Lord for MEMORYFOAM !!!!!! It has revolutionised sleep, no more hip or back pains. We used a mattress topper for a few years but found it shifted a bit each night and as they are pretty heavy and hard to move, bedmaking was a chore each day. When we needed a new mattress we thought we'd go the whole hog and get a full memory foam mattress but it was too much, we couldn't turn over,couldn't move and couldn't get up off it each morning (we resembled two beached whales !) So we have compromised and bought a firm mattress with a layer of memory foam incorporated, Success!! I also use a memory foam pillow, but have a regular one underneath as I need two. Again - success !!
If I were you Kazal, I'd push the boat out (not the cruise one) and go for it now, why wait and miss out on all that good sleep.