Looking to replace a Vispring Elite on a sprung divan base

I am 5'3, 14 stone and suffer from night leg cramps and lower leg pain. My partner is 6'3, 14 stone and suffers from an arthritic back and leg pain.
We currently have a goose down topper on a medium Vispring Elite on a sprung divan base which is 15 years old and we are looking to replace. What bed from your range would you recommend?