Hi. I'm looking to purchase a good quality mattress (open budget at the moment!) that will accommodate my spinal cord injury. I am 24 yrs post injury and have a metal plate in my neck and weakness on my right dominate side which now causes occasional hip pain if I roll on this side (my preferred sleeping side). Hence keen to change a 'very old' mattress. I am independent in getting myself in and out of bed and I weigh 8st. My bed is a good quality wooden slatted bed. After reading the extremely helpful information on your website I am leaning towards pocket sprung natural fibre mattress but not sure if this is the best or the gsm of the filling?