I decided on a surgeon based on speaking with other patients and meeting with the surgeon. The Bariatric group he was a part of was a Center of Excellence, which made me more comfortable with my decision.
How long it takes is totally up to your surgeon and insurance company. In my case, my insurance required 6 months of supervised weight loss with my primary care physician. After that was done, I had to pass a psych evaluation, make several visits with a dietician and not gain any weight during this period of time. I started with my first visit to the Bariatric Center November, 2010 and had my surgery in September, 2011.
My understanding is you will have to pay $5,000 first and then 30% of the additional costs until you reach your maximum out of pocket expense (you don't state what that is). Our plan is January through December, and each January you start over with the deductible and out of pocket expense.
I don't know a lot about the band, but my surgeon advised me against it. And I hear nothing good on these forums about the band. Do a lot of research before you make your decision including discussing with your surgeon. Is there some reason you are not considering RNY?
My daughter has RNY and had two successful pregnancies. The second time she gained about 75 lbs but was able to get it off fairly quickly after birth.
Hope that helps.