Help on finding the right mattress for 30 stone body weight

Hi, I'm really struggling because at nearly 30 stone I know that nearly every mattress on the high street will be unsuitable and probably dip within a matter of months. Further more I'm embarrassed when at the thought of going to try them all in their stores given my weight. I know that being obese usually limits my choices but I found your site and like your advice for bariatric mattresses. I've been left asking, what kind of bed a heavy person like me should look for? I want a bed that's going to be comfortable and supportive for my weight without being patronised or humiliated. Can you advise me as a heavy sleeper which of your bariatric mattresses would be best for me? I obviously need enough support so I don't wake up aching but also quite like a soft top layer in a bed. Is this even possible given my weight? Cheers Rod