Best latex mattress for us please?

In the last 6 years we have changed our bed 3 times and I still don't sleep well. I am 5'7 and 9 stone 5 and my husband is 5'8 and almost 13 stone. He loves our current 2400 pocket sprung mattress, but I toss and turn all night with pain in all parts of my body that rest on the mattress for more that about 20 minutes. I just don't know what to buy as he prefers firm and I prefer soft. I also find our mattress very warm as it has a layer of memory foam on top of the springs. Any suggestions would be really helpful?
Thanks.