I want to invest in a SIM - I'm comfortable on an airbed but it's playing havoc with my back. The dreamcatcher and dreamboat both get great reviews, but I don't know which one to go for. The dreamboat is about twice the price of the dreamcatcher, but I don't want to go for the cheaper one, only to have found I've wasted my money. I'm 5'10" and not the lightest. Really don't want to have my hips making contact with the ground! Any advice would be much appreciated, thanks.