9 st and 16 st sleepers, soft and medium feel, £1,200 budget

Hi, I am looking for super king size mattress. I am 9 stones and my partner 16,6 stones. Our budget is max £1,200. I saw your Origins 1500 but I am not quite sure that this one is suitable for us, because I do prefer soft feel.I have also viewed Artisan Naturals but it's slightly out of our budget.I'd like to buy from your website but I'm not sure If I can find right mattress for us in our price range. Is there some other mattress what would you reccommend me?Many Thanks.