you may have done this already, but i would post this question on the lapband message board if I were you, there will be lots of people who can answer your question there.
Hi, so far I have had good luck with pineapple and grapes. Bananas don't really do well because they are so dense I think. I'm not a big fruit eater but I would think that most would be ok as long as you chew them well and eat slowly.