I had a .8 neuroma removed in May of 2010. I am 40 and the doctors thought removing it would be the best thing because I have too many years of life left for regrowth. They also said that they don't have research about what effect the gamma knife is going to have 20-30 years down the road, and one concern is that cancer cells may grow. So from what I understand the gamma knife is a great option for older patients. This was all at Johns Hopkins.
All that being said, I think I would recommend you try any procedure before surgery. I have had some degree of a headache every minute of every day since my surgery. It has affected every area of my life. I ended up with occipital neuralgia that triggers migraines. I have pretty much exhausted every form of treatment, and have just had to adapt my life to living in some degree of constant head and neck pain. Obviously, not every patient develops a neuroma, but I wish I had paid more attention when the doctors said that ____% of patients develop headaches after surgery. I never imagined they meant 24-7.