Hello.We are looking for a new mattress to put on our platform topped base bed. Our old mattress feels to hard for both of us. I'm 5,2 and weigh under 9 stones. My husband is 5,6 and his weight is about 11 stones. We both sleep on the side. My husband suffers from the bad shoulder and back and we were wondering which mattress would be better for us? The Origins Comfort 1000 or the Origins 1500? We have tried some mattresses in bed store and we quite liked the medium feel ones. Would you recommend the Origins Comfort 1000 or the 1500 or do you think artisan range would be more suitable?