The lap band was over hyped and even some of the larger manufacturers are no longer making parts for them. My doctor won't even suggest it any more. As far as the balloon, it's currently under FDA review for a bunch of deaths, google "gastric balloon death". Personally, I'd stay away from either. The Gastric Sleeve might be the best bet for you at this point. I've been banded for 6 years, lost 70 lbs, but then just stopped, and I have a very hard time losing any more. I'm currently in the process of getting my band revised to the bypass.
Good luck!