M Line Hybrid 6 firm comparison mattress?

Hi, I am in the process of buying a mattress and a bed as I have just bought my first flat. I have tried a few mattresses in high street shops and the one I really like is the M Line hybrid 6 firm (king size). No one at Dreams can tell me the specs for this mattress though and the price is very high. Do you have a similar mattress to recommend? Can you please also recommend a bed for me? Slats or no slats for my ottoman bed? Thank you! P.s. I am glad I have found this website. You guys seem really knowledgable and products quality looks top notch!