Matress type from John Ryan to buy

Looking for new bed base and matress. I am 18.5 stone. Wife is 12 stone. She prefers hard bed, I side sleep prefer a bit more give. I like to be cool when I sleep, she likes warm. I move a lot in the night due to neck, shoulder pain (old injuries). Would pocket with latex top be good? Wife also likes electric blanket sometimes. Thanks. Finally would you recommend king or superking. We currently have king with Sealy mattress.