Bests bed for someone with bad shoulders?

I have dislocated my left shoulder several times playing sport. Unfortunately the only way I can get comfortable enough to fall asleep is to lie on my left hand side, which creates discomfort in my shoulder. Now my right shoulder is starting to give out on me as well (call it weak genetics). Can you recommend a good mattress that will protect my poor shoulders under my bodyweight? I've been looking through your catalogue and the best guess I can make is that the Artisan 1500 would perhaps suit me. I weigh 10.5 stone and I am 6 feet tall. Or maybe a foam mattress would be more forgiving? Thanks!