Pocket latex or Hybrid

I am looking for a new mattress to replace a memory foam which I find too hot. Even with a 4.5 tog duvet in the winter I wake several times a night overheating. I also suffer from hip/lower back problems, often waking with numb hips. We both sleep on our sides.
I have been looking at springs/" title="pocket spring">pocket spring with either latex or gel toppings. Two of the mattresses I found comfortable are the Highgrove gel infusion 2500 and Sealey Napoli (recommended by Which, but also shows very poor reviews on the Which website).
I have tried to compare these two against your latex toped pocket sprung mattress but my concern is at my weight – just under 10st and 5ft 5inchs it could be too firm for me according to your chart. My husband is 5ft 10 and around 13st.
The other option is a hybrid mattress, but I had talked myself out of anything that involved memory foam. By budget is around £700. I would be grateful for your comments. Great website!