Are there special dialogue options if I choose the white dragonborn character instead of making a custom one?

Not sure on that one. I can't stand playing a character without darkvision. Preferably improved. I personally like drow since you get a fuck load of dialog choice good and bad so you get to decide what type of drow you want to be. For Dark Urge you usually get two different choices also. Either give in to the urge or push it away. Both are stellar story experiences.