Hey RJ,
I'm a little younger than you. I started right around where you are at 405 pounds. I had surgery 9 months ago and have lost 100 pounds so far.
I couldn't be happier with my band.
Its true that you may lose faster initially with bypass, but many many bypass patients put it all back on. The band is a tremendous tool. If you have the willpower to use it properly there is no reason why you shouldn't be able to lose all that weight and keep it off forever.
Slow and steady is the name of this game.
If you have any specific questions fell free to send me a PM.
One thing I would mention to you if you are using Dr Kuri, make sure you have a doctor lined up back home to take care of your follow up care when you get home. The band is not a one time surgery, you need to get regular fills (once a month for the first year) for it to be effective.
Best of luck!