Hi Bookworm
Good advice so far from all the gang, though you may want to consider how you will work with your chosen surgical option, any of the banders here will tell you how hard it is to stay focused and not stray, plus there's a higher chance of issues with band slippage and band fills to think about, it is true that the bypass is a lot more pemanent solution and something to think about, though like others have said WLS has to be considered as your last option, therefore in my mind there's no going back.
My advice would be to listen to the advice of your consultant with an open mind, weight up all the pro's and cons of each option and then go for the one that suits you.
One last thing, its not true that all bypassers dump ! i'm able to eat practically anything and it really has very little effect on me.