Try the New Balance 993. It is a very comfortable shoe and will hold up to the pounding. I over pronate and have a very high arch. I owned 5 pairs of NB 587 prior to going to the 993. Both are great shoes, but the 993s are more comfortable.
I had my band placed and filled on 7/14/09. I had been biking, swimming, weight training and playing tennis prior to that. I asked my doctor some very specific questions regarding what I could do post op. He suggested walking only at first. I can add swimming after my incisions heal and other activities after about a month.