I'm interested in buying a king size latex mattress. I don't know where to start as I've been looking at so much information on the internet and it gets confusing and from site to site I find what seems to be conflicting information. I'm 5 feet and weigh 115 pounds and my husband is 6 feet and weighs 240 pounds. I'd like to know what firmness of latex to buy for us and what type of latex to buy dunlap or talalay.