I would love to be in Dauntless...The only thing is that I'm so cowardly I'd probably end up factionless. I think it's great that you're reading the book(s) before the movie, as I believe the books are always better. :)
Anyways, if I were in the book, my father would probably be a transfer from...I dunno somewhere not nice...? I mean he's nice but a lil' demanding at times. But he would be a transfer to Amity, which wouldn't be believable, so maybe Abnegation....And my mother would start out in one of them and either stay there or transfer. (So I'd start out in Amity or Abnegation. Going by my mother, probably Abnegation.) Then, I'd transfer to Dauntless, because let's face it, Abnegation stinks. I think I'd look the part...My friends say that I'd be in Abnegation or Erudite, and I wouldn't stand a chance in Dauntless. :)